[{"_id":"17202","article_number":"6400","year":"2024","file":[{"success":1,"relation":"main_file","content_type":"application/pdf","date_created":"2024-08-05T08:38:01Z","creator":"dernst","file_id":"17388","date_updated":"2024-08-05T08:38:01Z","file_name":"2024_NatureComm_Sagi.pdf","checksum":"ddf5361dcb6c543e2cea818501c09910","file_size":1928001,"access_level":"open_access"}],"related_material":{"link":[{"relation":"erratum","url":"https://doi.org/10.1038/s41467-024-53910-1"}],"record":[{"status":"public","id":"18076","relation":"dissertation_contains"},{"status":"public","id":"17196","relation":"research_data"}]},"type":"journal_article","status":"public","acknowledgement":"We acknowledge Lucas Casparis, Jeroen Danon, Valla Fatemi, Morten Kjaergard and Javad Shabani for their valuable insights and comments. This research was supported by the Scientific Service Units of ISTA through resources provided by the MIBA Machine Shop\r\nand the Nanofabrication facility. This research and related results were made possible with the support of the NOMIS Foundation and the FWF Projects with DOI:10.55776/I5060 and DOI:10.55776/P36507. We also acknowledge the NextGenerationEU PRIN project\r\n2022A8CJP3 (GAMESQUAD) for partial financial support.","date_published":"2024-07-30T00:00:00Z","OA_type":"gold","title":"A gate tunable transmon qubit in planar Ge","OA_place":"publisher","scopus_import":"1","doi":"10.1038/s41467-024-50763-6","day":"30","publication":"Nature Communications","volume":15,"file_date_updated":"2024-08-05T08:38:01Z","APC_amount":"6828 EUR","abstract":[{"lang":"eng","text":"Gate-tunable transmons (gatemons) employing semiconductor Josephson junctions have recently emerged as building blocks for hybrid quantum circuits. In this study, we present a gatemon fabricated in planar Germanium. We induce superconductivity in a two-dimensional hole gas by evaporating aluminum atop a thin spacer, which separates the superconductor from the Ge quantum well. The Josephson junction is then integrated into an Xmon circuit and capacitively coupled to a transmission line resonator. We showcase the qubit tunability in a broad frequency range with resonator and two-tone spectroscopy. Time-domain characterizations reveal energy relaxation and coherence times up to 75 ns. Our results, combined with the recent advances in the spin qubit field, pave the way towards novel hybrid and protected qubits in a group IV, CMOS-compatible material."}],"das_tickbox":"1","oa_version":"Published Version","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","dataavailabilitystatement":"All experimental data included in this work will be available at the ISTA Research Data Repository","supplementarymaterial":"yes","publication_status":"published","project":[{"_id":"bd8bd29e-d553-11ed-ba76-f0070d4b237a","name":"Merging spin and superconducting qubits in planar Ge","grant_number":"P36507"},{"grant_number":"I05060","_id":"c0977eea-5a5b-11eb-8a69-a862db0cf4d1","name":"High impedance circuit quantum electrodynamics with hole spins"},{"_id":"262116AA-B435-11E9-9278-68D0E5697425","name":"Hybrid Semiconductor - Superconductor Quantum Devices"},{"call_identifier":"FWF","_id":"3AC91DDA-15DF-11EA-824D-93A3E7B544D1","name":"FWF Open Access Fund"}],"pmid":1,"month":"07","quality_controlled":"1","article_processing_charge":"Yes","has_accepted_license":"1","publication_identifier":{"eissn":["2041-1723"]},"language":[{"iso":"eng"}],"researchdata_availability":"yes","date_updated":"2026-10-02T11:23:23Z","department":[{"_id":"GeKa"},{"_id":"JoFi"},{"_id":"GradSch"}],"oa":1,"arxiv":1,"author":[{"full_name":"Sagi, Oliver","first_name":"Oliver","id":"71616374-A8E9-11E9-A7CA-09ECE5697425","last_name":"Sagi"},{"orcid":"0000-0002-2968-611X","full_name":"Crippa, Alessandro","first_name":"Alessandro","id":"1F2B21A2-F6E7-11E9-9B82-F7DBE5697425","last_name":"Crippa"},{"id":"C0BB2FAC-D767-11E9-B658-BC13E6697425","first_name":"Marco","full_name":"Valentini, Marco","last_name":"Valentini"},{"orcid":"0009-0003-9037-8831","first_name":"Marian","full_name":"Janik, Marian","id":"396A1950-F248-11E8-B48F-1D18A9856A87","last_name":"Janik"},{"first_name":"Levon","full_name":"Baghumyan, Levon","id":"7aa1f788-b527-11ee-aa9e-e6111a79e0c7","last_name":"Baghumyan"},{"last_name":"Fabris","full_name":"Fabris, Giorgio","first_name":"Giorgio","id":"298cf6f3-1ff6-11ee-9fa6-d94cfa0b3352"},{"id":"84b9700b-15b2-11ec-abd3-831089e67615","first_name":"Lucky","full_name":"Kapoor, Lucky","orcid":"0000-0001-8319-2148","last_name":"Kapoor"},{"id":"2AED110C-F248-11E8-B48F-1D18A9856A87","first_name":"Farid","full_name":"Hassani, Farid","orcid":"0000-0001-6937-5773","last_name":"Hassani"},{"orcid":"0000-0001-8112-028X","first_name":"Johannes M","full_name":"Fink, Johannes M","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","last_name":"Fink"},{"first_name":"Stefano","full_name":"Calcaterra, Stefano","last_name":"Calcaterra"},{"first_name":"Daniel","full_name":"Chrastina, Daniel","last_name":"Chrastina"},{"full_name":"Isella, Giovanni","first_name":"Giovanni","last_name":"Isella"},{"last_name":"Katsaros","id":"38DB5788-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-8342-202X","first_name":"Georgios","full_name":"Katsaros, Georgios"}],"ddc":["530"],"article_type":"original","isi":1,"intvolume":"        15","corr_author":"1","external_id":{"isi":["001281271000022"],"pmid":["39080279"],"arxiv":["2403.16774"]},"citation":{"mla":"Sagi, Oliver, et al. “A Gate Tunable Transmon Qubit in Planar Ge.” <i>Nature Communications</i>, vol. 15, 6400, Springer Nature, 2024, doi:<a href=\"https://doi.org/10.1038/s41467-024-50763-6\">10.1038/s41467-024-50763-6</a>.","chicago":"Sagi, Oliver, Alessandro Crippa, Marco Valentini, Marian Janik, Levon Baghumyan, Giorgio Fabris, Lucky Kapoor, et al. “A Gate Tunable Transmon Qubit in Planar Ge.” <i>Nature Communications</i>. Springer Nature, 2024. <a href=\"https://doi.org/10.1038/s41467-024-50763-6\">https://doi.org/10.1038/s41467-024-50763-6</a>.","short":"O. Sagi, A. Crippa, M. Valentini, M. Janik, L. Baghumyan, G. Fabris, L. Kapoor, F. Hassani, J.M. Fink, S. Calcaterra, D. Chrastina, G. Isella, G. Katsaros, Nature Communications 15 (2024).","apa":"Sagi, O., Crippa, A., Valentini, M., Janik, M., Baghumyan, L., Fabris, G., … Katsaros, G. (2024). A gate tunable transmon qubit in planar Ge. <i>Nature Communications</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41467-024-50763-6\">https://doi.org/10.1038/s41467-024-50763-6</a>","ama":"Sagi O, Crippa A, Valentini M, et al. A gate tunable transmon qubit in planar Ge. <i>Nature Communications</i>. 2024;15. doi:<a href=\"https://doi.org/10.1038/s41467-024-50763-6\">10.1038/s41467-024-50763-6</a>","ista":"Sagi O, Crippa A, Valentini M, Janik M, Baghumyan L, Fabris G, Kapoor L, Hassani F, Fink JM, Calcaterra S, Chrastina D, Isella G, Katsaros G. 2024. A gate tunable transmon qubit in planar Ge. Nature Communications. 15, 6400.","ieee":"O. Sagi <i>et al.</i>, “A gate tunable transmon qubit in planar Ge,” <i>Nature Communications</i>, vol. 15. 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","status":"public","type":"research_data","related_material":{"record":[{"relation":"used_in_publication","id":"17202","status":"public"}]},"project":[{"_id":"c0977eea-5a5b-11eb-8a69-a862db0cf4d1","name":"High impedance circuit quantum electrodynamics with hole spins","grant_number":"I05060"},{"name":"Hybrid Semiconductor - Superconductor Quantum Devices","_id":"262116AA-B435-11E9-9278-68D0E5697425"},{"_id":"bd8bd29e-d553-11ed-ba76-f0070d4b237a","name":"Merging spin and superconducting qubits in planar Ge","grant_number":"P36507"}],"doi_confirm":"1","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","article_processing_charge":"No","has_accepted_license":"1","month":"07","file_date_updated":"2024-07-04T10:11:40Z","doi":"10.15479/AT:ISTA:17196","day":"04","oa_version":"Published Version","abstract":[{"lang":"eng","text":"This .zip File contains the data for the figures presented in the main text and supplementary material of \"A gate tunable transmon qubit in planar Ge\" by O.Sagi et al. The measurements were done using Qcodes. The description of the files and the instructions on opening the data can be found in the Readme. An additional Jupyter Notebook is attached that walks through the data analysis."}],"oa":1,"ddc":["530"],"author":[{"last_name":"Sagi","id":"71616374-A8E9-11E9-A7CA-09ECE5697425","full_name":"Sagi, Oliver","first_name":"Oliver"}],"department":[{"_id":"GradSch"},{"_id":"GeKa"},{"_id":"JoFi"}],"date_updated":"2026-10-02T11:23:23Z","publisher":"Institute of Science and Technology Austria","acknowledged_ssus":[{"_id":"NanoFab"},{"_id":"M-Shop"}],"date_created":"2024-07-04T10:14:34Z","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"fulldoi":"https://doi.org/10.15479/AT:ISTA:17196","citation":{"short":"O. Sagi, (2024).","chicago":"Sagi, Oliver. “A Gate-Tunable Transmon in Planar Ge.” Institute of Science and Technology Austria, 2024. <a href=\"https://doi.org/10.15479/AT:ISTA:17196\">https://doi.org/10.15479/AT:ISTA:17196</a>.","mla":"Sagi, Oliver. <i>A Gate-Tunable Transmon in Planar Ge</i>. Institute of Science and Technology Austria, 2024, doi:<a href=\"https://doi.org/10.15479/AT:ISTA:17196\">10.15479/AT:ISTA:17196</a>.","ista":"Sagi O. 2024. A gate-tunable transmon in planar Ge, Institute of Science and Technology Austria, <a href=\"https://doi.org/10.15479/AT:ISTA:17196\">10.15479/AT:ISTA:17196</a>.","ieee":"O. Sagi, “A gate-tunable transmon in planar Ge.” Institute of Science and Technology Austria, 2024.","apa":"Sagi, O. (2024). A gate-tunable transmon in planar Ge. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/AT:ISTA:17196\">https://doi.org/10.15479/AT:ISTA:17196</a>","ama":"Sagi O. A gate-tunable transmon in planar Ge. 2024. doi:<a href=\"https://doi.org/10.15479/AT:ISTA:17196\">10.15479/AT:ISTA:17196</a>"},"corr_author":"1"},{"oa":1,"author":[{"last_name":"Hassani","orcid":"0000-0001-6937-5773","full_name":"Hassani, Farid","first_name":"Farid","id":"2AED110C-F248-11E8-B48F-1D18A9856A87"}],"ddc":["530"],"date_updated":"2026-10-02T11:28:17Z","researchdata_availability":"no","language":[{"iso":"eng"}],"department":[{"_id":"GradSch"},{"_id":"JoFi"}],"date_created":"2024-06-11T18:20:05Z","acknowledged_ssus":[{"_id":"NanoFab"},{"_id":"M-Shop"}],"publisher":"Institute of Science and Technology Austria","alternative_title":["ISTA Thesis"],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode","image":"/images/cc_by_nc_sa.png","name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","short":"CC BY-NC-SA (4.0)"},"page":"161","corr_author":"1","citation":{"ista":"Hassani F. 2024. Superconducting qubits capable of dynamic switching between protected and high-speed control regimes. Institute of Science and Technology Austria.","ieee":"F. Hassani, “Superconducting qubits capable of dynamic switching between protected and high-speed control regimes,” Institute of Science and Technology Austria, 2024.","ama":"Hassani F. Superconducting qubits capable of dynamic switching between protected and high-speed control regimes. 2024. doi:<a href=\"https://doi.org/10.15479/at:ista:17133\">10.15479/at:ista:17133</a>","apa":"Hassani, F. (2024). <i>Superconducting qubits capable of dynamic switching between protected and high-speed control regimes</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/at:ista:17133\">https://doi.org/10.15479/at:ista:17133</a>","short":"F. Hassani, Superconducting Qubits Capable of Dynamic Switching between Protected and High-Speed Control Regimes, Institute of Science and Technology Austria, 2024.","chicago":"Hassani, Farid. “Superconducting Qubits Capable of Dynamic Switching between Protected and High-Speed Control Regimes.” Institute of Science and Technology Austria, 2024. <a href=\"https://doi.org/10.15479/at:ista:17133\">https://doi.org/10.15479/at:ista:17133</a>.","mla":"Hassani, Farid. <i>Superconducting Qubits Capable of Dynamic Switching between Protected and High-Speed Control Regimes</i>. Institute of Science and Technology Austria, 2024, doi:<a href=\"https://doi.org/10.15479/at:ista:17133\">10.15479/at:ista:17133</a>."},"fulldoi":"https://doi.org/10.15479/at:ista:17133","keyword":["Quantum information","Qubits","Superconducting devices"],"title":"Superconducting qubits capable of dynamic switching between protected and high-speed control regimes","OA_place":"publisher","_id":"17133","year":"2024","degree_awarded":"PhD","file":[{"content_type":"application/pdf","date_created":"2024-06-12T07:53:19Z","relation":"main_file","access_level":"open_access","checksum":"258c353d47fa37ea63ea43b1e10a34a0","date_updated":"2024-06-20T11:52:22Z","file_name":"Thesis_main_final.pdf","file_id":"17137","file_size":28370759,"creator":"fhassani"},{"date_created":"2024-06-12T07:54:27Z","content_type":"text/x-tex","relation":"source_file","access_level":"closed","file_size":445735,"file_id":"17138","file_name":"Thesis_main.tex","checksum":"deffa5d0db88093f74812fa71520d5e1","date_updated":"2024-06-12T07:54:27Z","creator":"fhassani"}],"type":"dissertation","related_material":{"record":[{"relation":"part_of_dissertation","status":"public","id":"13227"},{"status":"public","id":"9928","relation":"part_of_dissertation"},{"id":"8755","status":"public","relation":"part_of_dissertation"}]},"status":"public","date_published":"2024-06-11T00:00:00Z","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","supplementarymaterial":"no","doi_confirm":"1","publication_status":"published","project":[{"_id":"9B861AAC-BA93-11EA-9121-9846C619BF3A","name":"NOMIS Fellowship Program"},{"_id":"bdb108fd-d553-11ed-ba76-83dc74a9864f","name":"QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration of Superconducting Quantum Circuits","grant_number":"F07105"}],"month":"06","has_accepted_license":"1","article_processing_charge":"No","publication_identifier":{"issn":["2663-337X"],"isbn":["978-3-99078-040-4"]},"doi":"10.15479/at:ista:17133","day":"11","file_date_updated":"2024-06-20T11:52:22Z","supervisor":[{"orcid":"0000-0001-8112-028X","full_name":"Fink, Johannes M","first_name":"Johannes M","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","last_name":"Fink"}],"abstract":[{"text":"An ideal quantum computer relies on qubits capable of performing fast gate operations and\r\nmaintaining strong interconnections while preserving their quantum coherence. Since the\r\ninception of experimental eforts toward building a quantum computer, the community has\r\nfaced challenges in engineering such a system. Among the various methods of implementing a\r\nquantum computer, superconducting qubits have shown fast gates close to tens of nanoseconds,\r\nwith the state-of-the-art reaching a coherence of a few milliseconds. However, achieving\r\nsimultaneously long lifetimes with fast qubit operations poses an inherent paradox. Qubits\r\nwith high coherence require isolation from the environment, while fast operation necessitates\r\nstrong coupling of the qubit. This thesis approaches this issue by proposing the idea of\r\nengineering superconducting qubits capable of transitioning between operating in a protected\r\nregime, where the qubit is completely isolated from the environment, and coupling to the\r\ncommunication channels as needed. In this direction, we use the geometric superinductor to\r\nscan the parameter space of rf-SQUID devices, searching for a regime where we can take the\r\nqubit protection to its extreme.\r\n\r\nThis leads us to the inductively shunted transmon (IST) regime, characterized by EJ /EC ≫ 1\r\nand EJ /EL ≫ 1, where the circuit potential exhibits a double well with a large barrier\r\nseparating the local ground states of each quantum well. In this regime, although it is\r\nanticipated that the two quantum wells would be isolated from each other, we observe single\r\nfuxon tunneling between them. The interplay of the cavity photons and the fuxon transition\r\nforms a rich physical system, containing resonance conditions that allow the preparation of the\r\nfuxon ground or excited states. This enables us to study the relaxation rate of such transition\r\nand show that it can be as large as 3.6 hours. Dynamically controlling the barrier height\r\nbetween the two quantum wells allows for controllable coupling, which scales exponentially,\r\nfor a qubit encoded in two fuxon states.\r\nThe 0-π qubit is one of the very few known superconducting circuit types that ofers exponential\r\nprotection from both relaxation and dephasing simultaneously. However, this qubit is not\r\nexempt from the fact that such protection comes at the expense of complex readout and\r\ncontrol. In this thesis, we propose a way to controllably break the circuit symmetry, the\r\nkey reason for the protection, to momentarily restore the ability to control and manipulate\r\nthe qubit. An asymmetry in capacitances and inductances in the 0-π circuit is detrimental\r\nsince they lead to coupling of the protected state to the thermally occupied parasitic mode\r\nof the circuit. However, here we try to exploit a controlled asymmetry in Josephson energies\r\nand show that this can be used as a tunable coupler between the protected states. In the\r\nfuture, this should allow to perform gate operations by dynamically controlling the asymmetry\r\ninstead of driving the protected transition with microwave pulses. Therefore, we believe that\r\nthe proposed method can make the use of protected qubits more practical in experimental\r\nrealizations of quantum computing.","lang":"eng"}],"das_tickbox":"0","oa_version":"Published Version"},{"month":"08","quality_controlled":"1","article_processing_charge":"Yes","has_accepted_license":"1","publication_identifier":{"eissn":["2160-3308"]},"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","supplementarymaterial":"yes","publication_status":"published","abstract":[{"lang":"eng","text":"Trapped-ion systems are a leading platform for quantum information processing, but they are currently limited to 1D and 2D arrays, which imposes restrictions on both their scalability and their range of applications. Here, we propose a path to overcome this limitation by demonstrating that Penning traps can be used to realize remarkably clean bilayer crystals, wherein hundreds of ions self-organize into two well-defined layers. These bilayer crystals are made possible by the inclusion of an anharmonic trapping potential, which is readily implementable with current technology. We study the normal modes of this system and discover salient differences compared to the modes of single-plane crystals. The bilayer geometry and the unique properties of the normal modes open new opportunities—in particular, in quantum sensing and quantum simulation—that are not straightforward in single-plane crystals. Furthermore, we illustrate that it may be possible to extend the ideas presented here to realize multilayer crystals with more than two layers. Our work increases the dimensionality of trapped-ion systems by efficiently utilizing all three spatial dimensions, and it lays the foundation for a new generation of quantum information processing experiments with multilayer 3D crystals of trapped ions."}],"das_tickbox":"0","oa_version":"Published Version","doi":"10.1103/PhysRevX.14.031030","day":"16","issue":"3","file_date_updated":"2024-09-06T09:43:53Z","publication":"Physical Review X","volume":14,"title":"Bilayer crystals of trapped ions for quantum information processing","scopus_import":"1","type":"journal_article","status":"public","date_published":"2024-08-16T00:00:00Z","acknowledgement":"We thank M. Miskeen Khan, Jennifer Lilieholm, and Wes Johnson for a careful reading and feedback on the manuscript. We acknowledge discussions with Dan Dubin, John Zaris, and Scott Parker. S. H. acknowledges the support of Kishore Vaigyanik Protsahan Yojana, Department of Science and Technology, Government of India. A. S. acknowledges the support of a C. V. Raman post-doctoral fellowship. A. L. C., A. M. R., and J. J. B. acknowledge funding from the U.S. Department of Energy, Office of Science, NQI Science Research Centers, Quantum Systems Accelerator (QSA), a collaboration between the U.S. Department of Energy, Office of Science and other agencies. A. M. R. acknowledges additional support from VBFF, ARO Grant No. W911NF-24-1-0128, by the NSF Grants No. JILA-PFC PHY-2317149 and No. QLCI-OMA-2016244, and by NIST. J. J. B. acknowledges additional support from the DARPA ONISQ program and AFOSR Grant No. FA9550-201-0019.","article_number":"031030","_id":"17477","file":[{"creator":"cchlebak","access_level":"open_access","date_updated":"2024-09-06T09:43:53Z","file_id":"17757","checksum":"5d39b7dda67fd7b9a960235f6f38e280","file_name":"2024_PhysRevX_Hawaldar.pdf","file_size":3909653,"relation":"main_file","success":1,"content_type":"application/pdf","date_created":"2024-09-06T09:43:53Z"}],"year":"2024","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"date_created":"2024-09-01T22:01:08Z","DOAJ_listed":"1","publisher":"American Physical Society","external_id":{"isi":["001293977800002"],"arxiv":["2312.10681"]},"corr_author":"1","citation":{"ista":"Hawaldar S, Shahi P, Carter AL, Rey AM, Bollinger JJ, Shankar A. 2024. Bilayer crystals of trapped ions for quantum information processing. Physical Review X. 14(3), 031030.","ieee":"S. Hawaldar, P. Shahi, A. L. Carter, A. M. Rey, J. J. Bollinger, and A. Shankar, “Bilayer crystals of trapped ions for quantum information processing,” <i>Physical Review X</i>, vol. 14, no. 3. American Physical Society, 2024.","ama":"Hawaldar S, Shahi P, Carter AL, Rey AM, Bollinger JJ, Shankar A. Bilayer crystals of trapped ions for quantum information processing. <i>Physical Review X</i>. 2024;14(3). doi:<a href=\"https://doi.org/10.1103/PhysRevX.14.031030\">10.1103/PhysRevX.14.031030</a>","apa":"Hawaldar, S., Shahi, P., Carter, A. L., Rey, A. M., Bollinger, J. J., &#38; Shankar, A. (2024). Bilayer crystals of trapped ions for quantum information processing. <i>Physical Review X</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevX.14.031030\">https://doi.org/10.1103/PhysRevX.14.031030</a>","chicago":"Hawaldar, Samarth, Prakriti Shahi, Allison L. Carter, Ana Maria Rey, John J. Bollinger, and Athreya Shankar. “Bilayer Crystals of Trapped Ions for Quantum Information Processing.” <i>Physical Review X</i>. American Physical Society, 2024. <a href=\"https://doi.org/10.1103/PhysRevX.14.031030\">https://doi.org/10.1103/PhysRevX.14.031030</a>.","short":"S. Hawaldar, P. Shahi, A.L. Carter, A.M. Rey, J.J. Bollinger, A. Shankar, Physical Review X 14 (2024).","mla":"Hawaldar, Samarth, et al. “Bilayer Crystals of Trapped Ions for Quantum Information Processing.” <i>Physical Review X</i>, vol. 14, no. 3, 031030, American Physical Society, 2024, doi:<a href=\"https://doi.org/10.1103/PhysRevX.14.031030\">10.1103/PhysRevX.14.031030</a>."},"fulldoi":"https://doi.org/10.1103/PhysRevX.14.031030","article_type":"original","isi":1,"intvolume":"        14","author":[{"last_name":"Hawaldar","id":"221708e1-1ff6-11ee-9fa6-85146607433e","orcid":"0000-0002-1965-4309","first_name":"Samarth","full_name":"Hawaldar, Samarth"},{"first_name":"Prakriti","full_name":"Shahi, Prakriti","last_name":"Shahi"},{"last_name":"Carter","full_name":"Carter, Allison L.","first_name":"Allison L."},{"full_name":"Rey, Ana Maria","first_name":"Ana Maria","last_name":"Rey"},{"last_name":"Bollinger","first_name":"John J.","full_name":"Bollinger, John J."},{"last_name":"Shankar","first_name":"Athreya","full_name":"Shankar, Athreya"}],"ddc":["530"],"arxiv":1,"oa":1,"department":[{"_id":"JoFi"}],"language":[{"iso":"eng"}],"date_updated":"2026-10-15T09:06:46Z","researchdata_availability":"no"},{"status":"public","type":"journal_article","date_published":"2024-07-30T00:00:00Z","acknowledgement":"We gratefully acknowledge valuable discussions with Uros Delic, Lorenzo Magrini, and Corentin Gut. This work was supported by the European Union’s Horizon 2020 research and innovation program under Grant No. 863132 (iQLev) and No. 101080143 (SuperMeQ), the European Research Council under Grant No. 951234 (ERC Synergy QXtreme), the Austrian and Bavarian Academy of Sciences (Topical Team SGQ), the Alexander von Humboldt Foundation through a Feodor Lynen Fellowship (P.S.), the Swedish Research Council under Grant No. 2020-00381 (G.H.), and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via Germany’s Excellence Strategy EXC-2111-390814868 (H.H., R.G.).","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2401.08854","open_access":"1"}],"year":"2024","article_number":"014078","_id":"17410","title":"Remote sensing of a levitated superconductor with a flux-tunable microwave cavity","scopus_import":"1","abstract":[{"lang":"eng","text":"We present a cavity-electromechanical system comprising a superconducting quantum interference device which is embedded in a microwave resonator and coupled via a pickup loop to a 6-μ⁢g magnetically levitated superconducting sphere. The motion of the sphere in the magnetic trap induces a frequency shift in the SQUID-cavity system. We use microwave spectroscopy to characterize the system, and we demonstrate that the electromechanical interaction is tunable. The measured displacement sensitivity of 10−7m/√Hz defines a path towards ground-state cooling of levitated particles with Planck-scale masses at millikelvin environment temperatures."}],"oa_version":"Preprint","das_tickbox":"0","day":"30","doi":"10.1103/PhysRevApplied.22.014078","volume":22,"publication":"Physical Review Applied","quality_controlled":"1","month":"07","publication_identifier":{"eissn":["2331-7019"]},"article_processing_charge":"No","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","publication_status":"published","supplementarymaterial":"yes","date_updated":"2026-10-15T09:06:26Z","language":[{"iso":"eng"}],"department":[{"_id":"JoFi"}],"researchdata_availability":"yes","author":[{"full_name":"Schmidt, Philip","first_name":"Philip","last_name":"Schmidt"},{"last_name":"Claessen","first_name":"Remi","full_name":"Claessen, Remi"},{"full_name":"Higgins, Gerard","first_name":"Gerard","last_name":"Higgins"},{"full_name":"Hofer, Joachim","first_name":"Joachim","last_name":"Hofer"},{"last_name":"Hansen","first_name":"Jannek J.","full_name":"Hansen, Jannek J."},{"last_name":"Asenbaum","full_name":"Asenbaum, Peter","first_name":"Peter"},{"id":"2DCF8DE6-F248-11E8-B48F-1D18A9856A87","orcid":"0009-0005-0878-3032","full_name":"Zemlicka, Martin","first_name":"Martin","last_name":"Zemlicka"},{"last_name":"Uhl","full_name":"Uhl, Kevin","first_name":"Kevin"},{"first_name":"Reinhold","full_name":"Kleiner, Reinhold","last_name":"Kleiner"},{"first_name":"Rudolf","full_name":"Gross, Rudolf","last_name":"Gross"},{"last_name":"Huebl","full_name":"Huebl, Hans","first_name":"Hans"},{"full_name":"Trupke, Michael","first_name":"Michael","last_name":"Trupke"},{"last_name":"Aspelmeyer","full_name":"Aspelmeyer, Markus","first_name":"Markus"}],"oa":1,"arxiv":1,"external_id":{"isi":["001284571700002"],"arxiv":["2401.08854"]},"fulldoi":"https://doi.org/10.1103/PhysRevApplied.22.014078","citation":{"mla":"Schmidt, Philip, et al. “Remote Sensing of a Levitated Superconductor with a Flux-Tunable Microwave Cavity.” <i>Physical Review Applied</i>, vol. 22, 014078, American Physical Society, 2024, doi:<a href=\"https://doi.org/10.1103/PhysRevApplied.22.014078\">10.1103/PhysRevApplied.22.014078</a>.","chicago":"Schmidt, Philip, Remi Claessen, Gerard Higgins, Joachim Hofer, Jannek J. Hansen, Peter Asenbaum, Martin Zemlicka, et al. “Remote Sensing of a Levitated Superconductor with a Flux-Tunable Microwave Cavity.” <i>Physical Review Applied</i>. American Physical Society, 2024. <a href=\"https://doi.org/10.1103/PhysRevApplied.22.014078\">https://doi.org/10.1103/PhysRevApplied.22.014078</a>.","short":"P. Schmidt, R. Claessen, G. Higgins, J. Hofer, J.J. Hansen, P. Asenbaum, M. Zemlicka, K. Uhl, R. Kleiner, R. Gross, H. Huebl, M. Trupke, M. Aspelmeyer, Physical Review Applied 22 (2024).","apa":"Schmidt, P., Claessen, R., Higgins, G., Hofer, J., Hansen, J. J., Asenbaum, P., … Aspelmeyer, M. (2024). Remote sensing of a levitated superconductor with a flux-tunable microwave cavity. <i>Physical Review Applied</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevApplied.22.014078\">https://doi.org/10.1103/PhysRevApplied.22.014078</a>","ama":"Schmidt P, Claessen R, Higgins G, et al. Remote sensing of a levitated superconductor with a flux-tunable microwave cavity. <i>Physical Review Applied</i>. 2024;22. doi:<a href=\"https://doi.org/10.1103/PhysRevApplied.22.014078\">10.1103/PhysRevApplied.22.014078</a>","ista":"Schmidt P, Claessen R, Higgins G, Hofer J, Hansen JJ, Asenbaum P, Zemlicka M, Uhl K, Kleiner R, Gross R, Huebl H, Trupke M, Aspelmeyer M. 2024. Remote sensing of a levitated superconductor with a flux-tunable microwave cavity. Physical Review Applied. 22, 014078.","ieee":"P. Schmidt <i>et al.</i>, “Remote sensing of a levitated superconductor with a flux-tunable microwave cavity,” <i>Physical Review Applied</i>, vol. 22. American Physical Society, 2024."},"isi":1,"article_type":"original","intvolume":"        22","date_created":"2024-08-11T22:01:12Z","publisher":"American Physical Society"},{"das_tickbox":"1","oa_version":"Preprint","abstract":[{"text":"High kinetic inductance superconductors are gaining increasing interest for\r\nthe realisation of qubits, amplifiers and detectors. Moreover, thanks to their\r\nhigh impedance, quantum buses made of such materials enable large zero-point\r\nfluctuations of the voltage, boosting the coupling rates to spin and charge\r\nqubits. However, fully exploiting the potential of disordered or granular\r\nsuperconductors is challenging, as their inductance and, therefore, impedance\r\nat high values are difficult to control. Here we have integrated a granular\r\naluminium resonator, having a characteristic impedance exceeding the resistance\r\nquantum, with a germanium double quantum dot and demonstrate strong\r\ncharge-photon coupling with a rate of $g_\\text{c}/2\\pi= (566 \\pm 2)$ MHz. This\r\nwas achieved due to the realisation of a wireless ohmmeter, which allows\r\n\\emph{in situ} measurements during film deposition and, therefore, control of\r\nthe kinetic inductance of granular aluminium films. Reproducible fabrication of\r\ncircuits with impedances (inductances) exceeding 13 k$\\Omega$ (1 nH per square)\r\nis now possible. This broadly applicable method opens the path for novel qubits\r\nand high-fidelity, long-distance two-qubit gates.","lang":"eng"}],"publication":"arXiv","day":"03","doi":"10.48550/arXiv.2407.03079","article_processing_charge":"No","month":"07","supplementarymaterial":"unclear","project":[{"grant_number":"101069515","name":"Integrated Germanium Quantum Technology","_id":"34c0acea-11ca-11ed-8bc3-8775e10fd452"},{"call_identifier":"FWF","grant_number":"P32235","_id":"237B3DA4-32DE-11EA-91FC-C7463DDC885E","name":"Towards scalable hut wire quantum devices"},{"_id":"bd8bd29e-d553-11ed-ba76-f0070d4b237a","name":"Merging spin and superconducting qubits in planar Ge","grant_number":"P36507"},{"name":"High impedance circuit quantum electrodynamics with hole spins","_id":"c0977eea-5a5b-11eb-8a69-a862db0cf4d1","grant_number":"I05060"}],"publication_status":"draft","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","acknowledgement":"We acknowledge Franco De Palma, Mahya Khorramshahi, Fabian Oppliger, Thomas Reisinger, Pasquale Scarlino and Xiao Xue for helpful discussions. This research was supported by the Scientific Service Units of ISTA through resources provided by the MIBA Machine Shop and the Nanofabrication facility. This research and related results were made possible with the support of the NOMIS Foundation, the HORIZON-RIA 101069515 project, the FWF Projects with DOI:10.55776/P32235, DOI:10.55776/I5060 and DOI:10.55776/P36507. IMP acknowledges funding from the Deutsche Forschungsgemeinschaft (DFG – German Research Foundation) under project number 450396347 (GeHoldeQED). ICN2 acknowledges funding from Generalitat de Catalunya 2021SGR00457. We acknowledge support from CSIC Interdisciplinary Thematic Platform (PTI+) on Quantum Technologies (PTI-QTEP+). This research work has been funded by the European Commission – NextGenerationEU (Regulation EU 2020/2094), through CSIC’s\r\nQuantum Technologies Platform (QTEP). ICN2 is supported by the Severo Ochoa program from Spanish MCIN/AEI (Grant No.: CEX2021-001214-S) and is funded by the CERCA Programme/Generalitat de Catalunya. Part of the present work has been performed in the framework of Universitat Autònoma de Barcelona Materials Science PhD program. AGM has received funding from Grant RYC2021-033479-I funded by MCIN/AEI/10.13039/501100011033 and by European Union NextGenerationEU/PRTR. M.B. acknowledges support from SUR Generalitat de Catalunya and the EU Social Fund; project ref. 2020 FI 00103. The authors\r\nacknowledge the use of instrumentation and the technical advice provided by the Joint Electron Microscopy Center at ALBA (JEMCA). ICN2 acknowledges funding from Grant IU16-014206 (METCAM-FIB) funded by the European Union through the European Regional Development\r\nFund (ERDF), with the support of the Ministry of Research and Universities, Generalitat de Catalunya. ICN2 is a founding member of e-DREAM [60].","date_published":"2024-07-03T00:00:00Z","type":"preprint","related_material":{"record":[{"status":"public","id":"18886","relation":"research_data"},{"status":"public","id":"19401","relation":"later_version"},{"status":"public","id":"18129","relation":"dissertation_contains"}]},"status":"public","article_number":"2407.03079","_id":"18144","year":"2024","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2407.03079","open_access":"1"}],"title":"Strong charge-photon coupling in planar germanium enabled by granular  aluminium superinductors","OA_place":"repository","citation":{"ieee":"M. Janik <i>et al.</i>, “Strong charge-photon coupling in planar germanium enabled by granular  aluminium superinductors,” <i>arXiv</i>. .","ista":"Janik M, Roux KER, Borja Espinosa CN, Sagi O, Baghdadi A, Adletzberger T, Calcaterra S, Botifoll M, Manjón AG, Arbiol J, Chrastina D, Isella G, Pop IM, Katsaros G. Strong charge-photon coupling in planar germanium enabled by granular  aluminium superinductors. arXiv, 2407.03079.","apa":"Janik, M., Roux, K. E. R., Borja Espinosa, C. N., Sagi, O., Baghdadi, A., Adletzberger, T., … Katsaros, G. (n.d.). Strong charge-photon coupling in planar germanium enabled by granular  aluminium superinductors. <i>arXiv</i>. <a href=\"https://doi.org/10.48550/arXiv.2407.03079\">https://doi.org/10.48550/arXiv.2407.03079</a>","ama":"Janik M, Roux KER, Borja Espinosa CN, et al. Strong charge-photon coupling in planar germanium enabled by granular  aluminium superinductors. <i>arXiv</i>. doi:<a href=\"https://doi.org/10.48550/arXiv.2407.03079\">10.48550/arXiv.2407.03079</a>","short":"M. Janik, K.E.R. Roux, C.N. Borja Espinosa, O. Sagi, A. Baghdadi, T. Adletzberger, S. Calcaterra, M. Botifoll, A.G. Manjón, J. Arbiol, D. Chrastina, G. Isella, I.M. Pop, G. Katsaros, ArXiv (n.d.).","chicago":"Janik, Marian, Kevin Etienne Robert Roux, Carla N Borja Espinosa, Oliver Sagi, Abdulhamid Baghdadi, Thomas Adletzberger, Stefano Calcaterra, et al. “Strong Charge-Photon Coupling in Planar Germanium Enabled by Granular  Aluminium Superinductors.” <i>ArXiv</i>, n.d. <a href=\"https://doi.org/10.48550/arXiv.2407.03079\">https://doi.org/10.48550/arXiv.2407.03079</a>.","mla":"Janik, Marian, et al. “Strong Charge-Photon Coupling in Planar Germanium Enabled by Granular  Aluminium Superinductors.” <i>ArXiv</i>, 2407.03079, doi:<a href=\"https://doi.org/10.48550/arXiv.2407.03079\">10.48550/arXiv.2407.03079</a>."},"fulldoi":"https://doi.org/10.48550/arXiv.2407.03079","corr_author":"1","external_id":{"arxiv":["2407.03079"]},"tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"date_created":"2024-09-26T09:50:43Z","researchdata_availability":"yes","date_updated":"2026-11-08T23:31:13Z","department":[{"_id":"GeKa"},{"_id":"GradSch"},{"_id":"JoFi"}],"language":[{"iso":"eng"}],"author":[{"last_name":"Janik","id":"396A1950-F248-11E8-B48F-1D18A9856A87","full_name":"Janik, Marian","first_name":"Marian","orcid":"0009-0003-9037-8831"},{"last_name":"Roux","full_name":"Roux, Kevin Etienne Robert","first_name":"Kevin Etienne Robert","id":"53f93ea2-803f-11ed-ab7e-b283135794ef"},{"last_name":"Borja Espinosa","id":"18777c01-896a-11ed-bdf8-e4851dc07d16","first_name":"Carla N","full_name":"Borja Espinosa, Carla N"},{"id":"71616374-A8E9-11E9-A7CA-09ECE5697425","first_name":"Oliver","full_name":"Sagi, Oliver","last_name":"Sagi"},{"full_name":"Baghdadi, Abdulhamid","first_name":"Abdulhamid","id":"160D87FA-96B5-11E9-BF77-7626E6697425","last_name":"Baghdadi"},{"last_name":"Adletzberger","full_name":"Adletzberger, Thomas","first_name":"Thomas","id":"38756BB2-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Calcaterra","first_name":"Stefano","full_name":"Calcaterra, Stefano"},{"last_name":"Botifoll","first_name":"Marc","full_name":"Botifoll, Marc"},{"full_name":"Manjón, Alba Garzón","first_name":"Alba Garzón","last_name":"Manjón"},{"last_name":"Arbiol","first_name":"Jordi","full_name":"Arbiol, Jordi"},{"last_name":"Chrastina","full_name":"Chrastina, Daniel","first_name":"Daniel"},{"first_name":"Giovanni","full_name":"Isella, Giovanni","last_name":"Isella"},{"last_name":"Pop","first_name":"Ioan M.","full_name":"Pop, Ioan M."},{"last_name":"Katsaros","orcid":"0000-0001-8342-202X","full_name":"Katsaros, Georgios","first_name":"Georgios","id":"38DB5788-F248-11E8-B48F-1D18A9856A87"}],"arxiv":1,"oa":1},{"tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"DOAJ_listed":"1","date_created":"2024-06-27T10:58:06Z","publisher":"American Physical Society","acknowledged_ssus":[{"_id":"M-Shop"}],"external_id":{"isi":["001171652500001"],"arxiv":["2210.14182"]},"corr_author":"1","fulldoi":"https://doi.org/10.1103/prxquantum.5.010327","citation":{"mla":"Sett, Riya, et al. “Emergent Macroscopic Bistability Induced by a Single Superconducting Qubit.” <i>PRX Quantum</i>, vol. 5, no. 1, 010327, American Physical Society, 2024, doi:<a href=\"https://doi.org/10.1103/prxquantum.5.010327\">10.1103/prxquantum.5.010327</a>.","chicago":"Sett, Riya, Farid Hassani, Duc T Phan, Shabir Barzanjeh, Andras Vukics, and Johannes M Fink. “Emergent Macroscopic Bistability Induced by a Single Superconducting Qubit.” <i>PRX Quantum</i>. American Physical Society, 2024. <a href=\"https://doi.org/10.1103/prxquantum.5.010327\">https://doi.org/10.1103/prxquantum.5.010327</a>.","short":"R. Sett, F. Hassani, D.T. Phan, S. Barzanjeh, A. Vukics, J.M. Fink, PRX Quantum 5 (2024).","ama":"Sett R, Hassani F, Phan DT, Barzanjeh S, Vukics A, Fink JM. Emergent macroscopic bistability induced by a single superconducting qubit. <i>PRX Quantum</i>. 2024;5(1). doi:<a href=\"https://doi.org/10.1103/prxquantum.5.010327\">10.1103/prxquantum.5.010327</a>","apa":"Sett, R., Hassani, F., Phan, D. T., Barzanjeh, S., Vukics, A., &#38; Fink, J. M. (2024). Emergent macroscopic bistability induced by a single superconducting qubit. <i>PRX Quantum</i>. American Physical Society. <a href=\"https://doi.org/10.1103/prxquantum.5.010327\">https://doi.org/10.1103/prxquantum.5.010327</a>","ieee":"R. Sett, F. Hassani, D. T. Phan, S. Barzanjeh, A. Vukics, and J. M. Fink, “Emergent macroscopic bistability induced by a single superconducting qubit,” <i>PRX Quantum</i>, vol. 5, no. 1. American Physical Society, 2024.","ista":"Sett R, Hassani F, Phan DT, Barzanjeh S, Vukics A, Fink JM. 2024. Emergent macroscopic bistability induced by a single superconducting qubit. PRX Quantum. 5(1), 010327."},"isi":1,"article_type":"original","intvolume":"         5","author":[{"last_name":"Sett","orcid":"0000-0001-7641-8348","full_name":"Sett, Riya","first_name":"Riya","id":"2E6D040E-F248-11E8-B48F-1D18A9856A87"},{"id":"2AED110C-F248-11E8-B48F-1D18A9856A87","full_name":"Hassani, Farid","first_name":"Farid","orcid":"0000-0001-6937-5773","last_name":"Hassani"},{"id":"29C8C0B4-F248-11E8-B48F-1D18A9856A87","first_name":"Duc T","full_name":"Phan, Duc T","last_name":"Phan"},{"last_name":"Barzanjeh","id":"2D25E1F6-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-0415-1423","first_name":"Shabir","full_name":"Barzanjeh, Shabir"},{"last_name":"Vukics","full_name":"Vukics, Andras","first_name":"Andras"},{"full_name":"Fink, Johannes M","first_name":"Johannes M","orcid":"0000-0001-8112-028X","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","last_name":"Fink"}],"ddc":["530"],"ec_funded":1,"arxiv":1,"oa":1,"researchdata_availability":"yes","language":[{"iso":"eng"}],"date_updated":"2026-11-08T23:31:16Z","department":[{"_id":"JoFi"},{"_id":"AnHi"}],"quality_controlled":"1","month":"02","publication_identifier":{"eissn":["2691-3399"]},"article_processing_charge":"Yes","has_accepted_license":"1","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","publication_status":"published","project":[{"_id":"237CBA6C-32DE-11EA-91FC-C7463DDC885E","name":"Quantum readout techniques and technologies","call_identifier":"H2020","grant_number":"862644"},{"call_identifier":"FWF","name":"FWF Open Access Fund","_id":"3AC91DDA-15DF-11EA-824D-93A3E7B544D1"},{"grant_number":"F07105","_id":"bdb108fd-d553-11ed-ba76-83dc74a9864f","name":"QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration of Superconducting Quantum Circuits"}],"supplementarymaterial":"yes","abstract":[{"text":"The photon blockade breakdown in a continuously driven cavity QED system has been proposed as a prime example for a first-order driven-dissipative quantum phase transition. However, the predicted scaling from a microscopic behavior—dominated by quantum fluctuations—to a macroscopic one—characterized by stable phases—and the associated exponents and phase diagram have not been observed so far. In this work we couple a single transmon qubit with a fixed coupling strength 𝑔 to a superconducting cavity that is in situ bandwidth 𝜅 tunable to controllably approach this thermodynamic limit. Even though the system remains microscopic, we observe its behavior becoming increasingly macroscopic as a function of 𝑔/𝜅. For the highest realized 𝑔/𝜅 of approximately 287, the system switches with a characteristic timescale as long as 6 s between a bright coherent state with approximately 8×103 intracavity photons and the vacuum state. This exceeds the microscopic timescales by 6 orders of magnitude and approaches the perfect hysteresis expected between two macroscopic attractors in the thermodynamic limit. These findings and interpretation are qualitatively supported by neoclassical theory and large-scale quantum-jump Monte Carlo simulations. Besides shedding more light on driven-dissipative physics in the limit of strong light-matter coupling, this system might also find applications in quantum sensing and metrology.","lang":"eng"}],"APC_amount":"3782,54","oa_version":"Published Version","das_tickbox":"0","doi":"10.1103/prxquantum.5.010327","day":"16","file_date_updated":"2024-06-28T12:04:43Z","volume":5,"publication":"PRX Quantum","issue":"1","OA_place":"publisher","title":"Emergent macroscopic bistability induced by a single superconducting qubit","scopus_import":"1","OA_type":"gold","status":"public","related_material":{"record":[{"relation":"research_data","status":"public","id":"18978"},{"relation":"dissertation_contains","id":"19533","status":"public"}]},"type":"journal_article","acknowledgement":"This work has received funding from the Austrian Science Fund (FWF) through BeyondC (F7105) and the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 862644 (FETopen QUARTET). A.V. acknowledges support from the National Research, Development and Innovation Office of Hungary (NKFIH) within the Quantum Information National Laboratory of Hungary. The authors thank the MIBA workshop and the Institute of Science and Technology Austria nanofabrication facility for technical support. We are grateful to HUN-REN Cloud for providing us with suitable computational infrastructure for the simulations.","date_published":"2024-02-16T00:00:00Z","year":"2024","file":[{"date_updated":"2024-06-28T12:04:43Z","checksum":"0833880d47f74ad1deda93a1d8ffa5a7","file_id":"17185","file_name":"2024_PRXQuantum_Sett.pdf","file_size":1443351,"access_level":"open_access","creator":"cchlebak","content_type":"application/pdf","date_created":"2024-06-28T12:04:43Z","success":1,"relation":"main_file"}],"article_number":"010327","_id":"17183"},{"day":"16","doi":"10.5281/ZENODO.10518320","abstract":[{"text":"Data analysis files for the manuscript \"Emergent Macroscopic Bistability Induced by a Single Superconducting Qubit\".\r\n\r\nThis contains the raw data and the data analysis files for generating the figures in the manuscript.\r\n\r\n Figure1 file - The raw data of cavity transmission spectra for 6 different kappas are there. They are fitted with input-output theory in the python file.\r\n Figure2 file - The raw data at 8 MHz kappa are included. all hte figures in figure 2 are generated in the python file\r\n Figure3 file - The raw data of PBB single shot measurements at all kappas are included. The detailed analysis and the Figure3 generated for the paper are all in the python analysis file. Also, thefiles containing the time-evolution of the intensity from Master Equation solution are included.\r\nFigure4 file - The raw data at 2.6 MHz for different drive detunings and the corresponding analyses are included. And the python file includes the analysis of the experimental data as well as approximate neoclassical equations solutions for 2-level and 3-level transmons are included.  ","lang":"eng"}],"corr_author":"1","citation":{"ista":"Sett R, Hassani F, Phan DT, Barzanjeh S, Vukics A, Fink JM. 2024. Data Analysis files for ‘Emergent Macroscopic Bistability Induced by a Single Superconducting Qubit’, Zenodo, <a href=\"https://doi.org/10.5281/ZENODO.10518320\">10.5281/ZENODO.10518320</a>.","ieee":"R. Sett, F. Hassani, D. T. Phan, S. Barzanjeh, A. Vukics, and J. M. Fink, “Data Analysis files for ‘Emergent Macroscopic Bistability Induced by a Single Superconducting Qubit.’” Zenodo, 2024.","ama":"Sett R, Hassani F, Phan DT, Barzanjeh S, Vukics A, Fink JM. Data Analysis files for “Emergent Macroscopic Bistability Induced by a Single Superconducting Qubit.” 2024. doi:<a href=\"https://doi.org/10.5281/ZENODO.10518320\">10.5281/ZENODO.10518320</a>","apa":"Sett, R., Hassani, F., Phan, D. T., Barzanjeh, S., Vukics, A., &#38; Fink, J. M. (2024). Data Analysis files for “Emergent Macroscopic Bistability Induced by a Single Superconducting Qubit.” Zenodo. <a href=\"https://doi.org/10.5281/ZENODO.10518320\">https://doi.org/10.5281/ZENODO.10518320</a>","chicago":"Sett, Riya, Farid Hassani, Duc T Phan, Shabir Barzanjeh, Andras Vukics, and Johannes M Fink. “Data Analysis Files for ‘Emergent Macroscopic Bistability Induced by a Single Superconducting Qubit.’” Zenodo, 2024. <a href=\"https://doi.org/10.5281/ZENODO.10518320\">https://doi.org/10.5281/ZENODO.10518320</a>.","short":"R. Sett, F. Hassani, D.T. Phan, S. Barzanjeh, A. Vukics, J.M. Fink, (2024).","mla":"Sett, Riya, et al. <i>Data Analysis Files for “Emergent Macroscopic Bistability Induced by a Single Superconducting Qubit.”</i> Zenodo, 2024, doi:<a href=\"https://doi.org/10.5281/ZENODO.10518320\">10.5281/ZENODO.10518320</a>."},"oa_version":"Published Version","fulldoi":"https://doi.org/10.5281/ZENODO.10518320","date_created":"2025-01-30T08:30:03Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Zenodo","month":"01","article_processing_charge":"No","has_accepted_license":"1","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"date_updated":"2026-11-08T23:31:15Z","department":[{"_id":"JoFi"},{"_id":"AnHi"}],"main_file_link":[{"url":"https://doi.org/10.5281/zenodo.10518320","open_access":"1"}],"_id":"18978","year":"2024","type":"research_data_reference","related_material":{"record":[{"relation":"used_in_publication","id":"17183","status":"public"},{"id":"19533","status":"public","relation":"used_in_publication"}]},"status":"public","date_published":"2024-01-16T00:00:00Z","OA_type":"gold","oa":1,"title":"Data Analysis files for \"Emergent Macroscopic Bistability Induced by a Single Superconducting Qubit\"","author":[{"last_name":"Sett","id":"2E6D040E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-7641-8348","first_name":"Riya","full_name":"Sett, Riya"},{"last_name":"Hassani","id":"2AED110C-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6937-5773","full_name":"Hassani, Farid","first_name":"Farid"},{"first_name":"Duc T","full_name":"Phan, Duc T","id":"29C8C0B4-F248-11E8-B48F-1D18A9856A87","last_name":"Phan"},{"full_name":"Barzanjeh, Shabir","first_name":"Shabir","orcid":"0000-0003-0415-1423","id":"2D25E1F6-F248-11E8-B48F-1D18A9856A87","last_name":"Barzanjeh"},{"full_name":"Vukics, Andras","first_name":"Andras","last_name":"Vukics"},{"id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-8112-028X","full_name":"Fink, Johannes M","first_name":"Johannes M","last_name":"Fink"}],"OA_place":"repository","ddc":["530"]},{"publisher":"American Physical Society","date_created":"2023-04-09T22:01:00Z","citation":{"short":"A. Sokolova, D.A. Kalacheva, G.P. Fedorov, O.V. Astafiev, Physical Review A 107 (2023).","chicago":"Sokolova, Alesya, D. A. Kalacheva, G. P. Fedorov, and O. V. Astafiev. “Overcoming Photon Blockade in a Circuit-QED Single-Atom Maser with Engineered Metastability and Strong Coupling.” <i>Physical Review A</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/PhysRevA.107.L031701\">https://doi.org/10.1103/PhysRevA.107.L031701</a>.","mla":"Sokolova, Alesya, et al. “Overcoming Photon Blockade in a Circuit-QED Single-Atom Maser with Engineered Metastability and Strong Coupling.” <i>Physical Review A</i>, vol. 107, no. 3, L031701, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/PhysRevA.107.L031701\">10.1103/PhysRevA.107.L031701</a>.","ista":"Sokolova A, Kalacheva DA, Fedorov GP, Astafiev OV. 2023. Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling. Physical Review A. 107(3), L031701.","ieee":"A. Sokolova, D. A. Kalacheva, G. P. Fedorov, and O. V. Astafiev, “Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling,” <i>Physical Review A</i>, vol. 107, no. 3. American Physical Society, 2023.","ama":"Sokolova A, Kalacheva DA, Fedorov GP, Astafiev OV. Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling. <i>Physical Review A</i>. 2023;107(3). doi:<a href=\"https://doi.org/10.1103/PhysRevA.107.L031701\">10.1103/PhysRevA.107.L031701</a>","apa":"Sokolova, A., Kalacheva, D. A., Fedorov, G. P., &#38; Astafiev, O. V. (2023). Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling. <i>Physical Review A</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevA.107.L031701\">https://doi.org/10.1103/PhysRevA.107.L031701</a>"},"fulldoi":"https://doi.org/10.1103/PhysRevA.107.L031701","external_id":{"isi":["000957799000006"],"arxiv":["2209.05165"]},"intvolume":"       107","article_type":"letter_note","isi":1,"author":[{"full_name":"Sokolova, Alesya","first_name":"Alesya","orcid":"0000-0002-8308-4144","id":"2d0a0600-edfb-11eb-afb5-c0f5fa7f4f3a","last_name":"Sokolova"},{"last_name":"Kalacheva","full_name":"Kalacheva, D. A.","first_name":"D. A."},{"last_name":"Fedorov","full_name":"Fedorov, G. P.","first_name":"G. P."},{"full_name":"Astafiev, O. V.","first_name":"O. V.","last_name":"Astafiev"}],"oa":1,"arxiv":1,"language":[{"iso":"eng"}],"department":[{"_id":"JoFi"}],"date_updated":"2023-08-01T14:06:05Z","article_processing_charge":"No","publication_identifier":{"issn":["2469-9926"],"eissn":["2469-9934"]},"month":"03","quality_controlled":"1","publication_status":"published","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","oa_version":"Preprint","abstract":[{"text":"Reaching a high cavity population with a coherent pump in the strong-coupling regime of a single-atom laser is impossible due to the photon blockade effect. In this Letter, we experimentally demonstrate that in a single-atom maser based on a transmon strongly coupled to two resonators, it is possible to pump over a dozen photons into the system. The first high-quality resonator plays the role of a usual lasing cavity, and the second one presents a controlled dissipation channel, bolstering population inversion, and modifies the energy-level structure to lift the blockade. As confirmation of the lasing action, we observe conventional laser features such as a narrowing of the emission linewidth and external signal amplification. Additionally, we report unique single-atom features: self-quenching and several lasing thresholds.","lang":"eng"}],"issue":"3","volume":107,"publication":"Physical Review A","day":"22","doi":"10.1103/PhysRevA.107.L031701","scopus_import":"1","title":"Overcoming photon blockade in a circuit-QED single-atom maser with engineered metastability and strong coupling","date_published":"2023-03-22T00:00:00Z","acknowledgement":"We thank N.N. Abramov for assistance with the experimental setup. The sample was fabricated using equipment of MIPT Shared Facilities Center. This research was supported by Russian Science Foundation, grant no. 21-72-30026.","type":"journal_article","status":"public","article_number":"L031701","_id":"12819","year":"2023","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2209.05165"}]},{"has_accepted_license":"1","article_processing_charge":"No","publication_identifier":{"issn":["2663-337X"],"isbn":["978-3-99078-030-5"]},"month":"05","publication_status":"published","project":[{"name":"A Fiber Optic Transceiver for Superconducting Qubits","_id":"26336814-B435-11E9-9278-68D0E5697425","grant_number":"758053","call_identifier":"H2020"},{"call_identifier":"H2020","grant_number":"899354","_id":"9B868D20-BA93-11EA-9121-9846C619BF3A","name":"Quantum Local Area Networks with Superconducting Qubits"},{"grant_number":"F07105","name":"QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration of Superconducting Quantum Circuits","_id":"bdb108fd-d553-11ed-ba76-83dc74a9864f"}],"user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","oa_version":"Published Version","abstract":[{"lang":"eng","text":"About a 100 years ago, we discovered that our universe is inherently noisy, that is, measuring any physical quantity with a precision beyond a certain point is not possible because of an omnipresent inherent noise. We call this - the quantum noise. Certain physical processes allow this quantum noise to get correlated in conjugate physical variables. These quantum correlations can be used to go beyond the potential of our inherently noisy universe and obtain a quantum advantage over the classical applications. \r\n\r\nQuantum noise being inherent also means that, at the fundamental level, the physical quantities are not well defined and therefore, objects can stay in multiple states at the same time. For example, the position of a particle not being well defined means that the particle is in multiple positions at the same time. About 4 decades ago, we started exploring the possibility of using objects which can be in multiple states at the same time to increase the dimensionality in computation. Thus, the field of quantum computing was born. We discovered that using quantum entanglement, a property closely related to quantum correlations, can be used to speed up computation of certain problems, such as factorisation of large numbers, faster than any known classical algorithm. Thus began the pursuit to make quantum computers a reality. \r\n\r\nTill date, we have explored quantum control over many physical systems including photons, spins, atoms, ions and even simple circuits made up of superconducting material. However, there persists one ubiquitous theme. The more readily a system interacts with an external field or matter, the more easily we can control it. But this also means that such a system can easily interact with a noisy environment and quickly lose its coherence. Consequently, such systems like electron spins need to be protected from the environment to ensure the longevity of their coherence. Other systems like nuclear spins are naturally protected as they do not interact easily with the environment. But, due to the same reason, it is harder to interact with such systems. \r\n\r\nAfter decades of experimentation with various systems, we are convinced that no one type of quantum system would be the best for all the quantum applications. We would need hybrid systems which are all interconnected - much like the current internet where all sorts of devices can all talk to each other - but now for quantum devices. A quantum internet. \r\n\r\nOptical photons are the best contenders to carry information for the quantum internet. They can carry quantum information cheaply and without much loss - the same reasons which has made them the backbone of our current internet. Following this direction, many systems, like trapped ions, have already demonstrated successful quantum links over a large distances using optical photons. However, some of the most promising contenders for quantum computing which are based on microwave frequencies have been left behind. This is because high energy optical photons can adversely affect fragile low-energy microwave systems. \r\n\r\nIn this thesis, we present substantial progress on this missing quantum link between microwave and optics using electrooptical nonlinearities in lithium niobate. The nonlinearities are enhanced by using resonant cavities for all the involved modes leading to observation of strong direct coupling between optical and microwave frequencies. With this strong coupling we are not only able to achieve almost 100\\% internal conversion efficiency with low added noise, thus presenting a quantum-enabled transducer, but also we are able to observe novel effects such as cooling of a microwave mode using optics. The strong coupling regime also leads to direct observation of dynamical backaction effect between microwave and optical frequencies which are studied in detail here. Finally, we also report first observation of microwave-optics entanglement in form of two-mode squeezed vacuum squeezed 0.7dB below vacuum level. \r\nWith this new bridge between microwave and optics, the microwave-based quantum technologies can finally be a part of a quantum network which is based on optical photons - putting us one step closer to a future with quantum internet. "}],"supervisor":[{"id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-8112-028X","first_name":"Johannes M","full_name":"Fink, Johannes M","last_name":"Fink"}],"file_date_updated":"2023-07-06T11:37:40Z","day":"05","doi":"10.15479/at:ista:12900","title":"Cavity quantum electrooptics","OA_place":"publisher","keyword":["quantum optics","electrooptics","quantum networks","quantum communication","transduction"],"date_published":"2023-05-05T00:00:00Z","type":"dissertation","related_material":{"record":[{"relation":"new_edition","status":"public","id":"13175"},{"status":"public","id":"10924","relation":"part_of_dissertation"},{"status":"public","id":"9114","relation":"part_of_dissertation"}]},"status":"public","_id":"12900","file":[{"relation":"source_file","embargo_to":"open_access","date_created":"2023-05-09T08:45:14Z","content_type":"application/x-zip-compressed","creator":"rsahu","access_level":"closed","file_size":36767177,"file_id":"12928","file_name":"thesis.zip","checksum":"8cbdab9c37ee55e591092a6f66b272c4","date_updated":"2023-06-06T22:30:03Z"},{"access_level":"closed","file_size":17501990,"file_id":"12929","file_name":"thesis_pdfa_final.pdf","checksum":"439659ead46618147309be39d9dd5a8c","date_updated":"2023-07-06T11:37:40Z","creator":"rsahu","date_created":"2023-05-09T08:51:17Z","content_type":"application/pdf","relation":"main_file"}],"degree_awarded":"PhD","year":"2023","alternative_title":["ISTA Thesis"],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode","image":"/images/cc_by_nc_sa.png","name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","short":"CC BY-NC-SA (4.0)"},"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"SSU"},{"_id":"NanoFab"}],"publisher":"Institute of Science and Technology Austria","date_created":"2023-05-05T11:08:50Z","citation":{"ama":"Sahu R. Cavity quantum electrooptics. 2023. doi:<a href=\"https://doi.org/10.15479/at:ista:12900\">10.15479/at:ista:12900</a>","apa":"Sahu, R. (2023). <i>Cavity quantum electrooptics</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/at:ista:12900\">https://doi.org/10.15479/at:ista:12900</a>","ista":"Sahu R. 2023. Cavity quantum electrooptics. Institute of Science and Technology Austria.","ieee":"R. Sahu, “Cavity quantum electrooptics,” Institute of Science and Technology Austria, 2023.","mla":"Sahu, Rishabh. <i>Cavity Quantum Electrooptics</i>. Institute of Science and Technology Austria, 2023, doi:<a href=\"https://doi.org/10.15479/at:ista:12900\">10.15479/at:ista:12900</a>.","short":"R. Sahu, Cavity Quantum Electrooptics, Institute of Science and Technology Austria, 2023.","chicago":"Sahu, Rishabh. “Cavity Quantum Electrooptics.” Institute of Science and Technology Austria, 2023. <a href=\"https://doi.org/10.15479/at:ista:12900\">https://doi.org/10.15479/at:ista:12900</a>."},"fulldoi":"https://doi.org/10.15479/at:ista:12900","corr_author":"1","page":"190","ddc":["537","535","539"],"author":[{"last_name":"Sahu","id":"47D26E34-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6264-2162","first_name":"Rishabh","full_name":"Sahu, Rishabh"}],"ec_funded":1,"department":[{"_id":"GradSch"},{"_id":"JoFi"}],"language":[{"iso":"eng"}],"date_updated":"2026-04-15T06:43:26Z"},{"_id":"13106","year":"2023","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2301.03315"}],"acknowledgement":"This work was supported by the European Research Council (grant no. 758053, ERC StG QUNNECT) and the European Union’s Horizon 2020 Research and Innovation Program (grant no. 899354, FETopen SuperQuLAN). L.Q. acknowledges generous support from the ISTFELLOW program. W.H. is the recipient of an ISTplus postdoctoral fellowship with funding from the European Union’s Horizon 2020 Research and Innovation Program (Marie Sklodowska-Curie grant no. 754411). G.A. is the recipient of a DOC fellowship of the Austrian Academy of Sciences at IST Austria. J.M.F. acknowledges support from the Austrian Science Fund (FWF) through BeyondC (grant no. F7105) and the European Union’s Horizon 2020 Research and Innovation Program (grant no. 862644, FETopen QUARTET).","date_published":"2023-05-18T00:00:00Z","related_material":{"link":[{"url":"https://ista.ac.at/en/news/wiring-up-quantum-circuits-with-light/","relation":"press_release","description":"News on ISTA Website"}],"record":[{"status":"public","id":"13122","relation":"research_data"}]},"type":"journal_article","status":"public","keyword":["Multidisciplinary"],"scopus_import":"1","title":"Entangling microwaves with light","issue":"6646","publication":"Science","volume":380,"doi":"10.1126/science.adg3812","day":"18","oa_version":"Preprint","abstract":[{"text":"Quantum entanglement is a key resource in currently developed quantum technologies. Sharing this fragile property between superconducting microwave circuits and optical or atomic systems would enable new functionalities, but this has been hindered by an energy scale mismatch of >104 and the resulting mutually imposed loss and noise. In this work, we created and verified entanglement between microwave and optical fields in a millikelvin environment. Using an optically pulsed superconducting electro-optical device, we show entanglement between propagating microwave and optical fields in the continuous variable domain. This achievement not only paves the way for entanglement between superconducting circuits and telecom wavelength light, but also has wide-ranging implications for hybrid quantum networks in the context of modularization, scaling, sensing, and cross-platform verification.","lang":"eng"}],"project":[{"name":"A Fiber Optic Transceiver for Superconducting Qubits","_id":"26336814-B435-11E9-9278-68D0E5697425","grant_number":"758053","call_identifier":"H2020"},{"call_identifier":"H2020","grant_number":"899354","_id":"9B868D20-BA93-11EA-9121-9846C619BF3A","name":"Quantum Local Area Networks with Superconducting Qubits"},{"_id":"260C2330-B435-11E9-9278-68D0E5697425","name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020","grant_number":"754411"},{"grant_number":"862644","call_identifier":"H2020","name":"Quantum readout techniques and technologies","_id":"237CBA6C-32DE-11EA-91FC-C7463DDC885E"},{"name":"Coherent on-chip conversion of superconducting qubit signals from microwaves to optical frequencies","_id":"2671EB66-B435-11E9-9278-68D0E5697425"},{"grant_number":"F07105","_id":"bdb108fd-d553-11ed-ba76-83dc74a9864f","name":"QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration of Superconducting Quantum Circuits"}],"publication_status":"published","pmid":1,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_processing_charge":"No","publication_identifier":{"eissn":["1095-9203"],"issn":["0036-8075"]},"month":"05","quality_controlled":"1","language":[{"iso":"eng"}],"department":[{"_id":"JoFi"}],"date_updated":"2026-04-15T06:39:33Z","oa":1,"arxiv":1,"ec_funded":1,"author":[{"first_name":"Rishabh","full_name":"Sahu, Rishabh","orcid":"0000-0001-6264-2162","id":"47D26E34-F248-11E8-B48F-1D18A9856A87","last_name":"Sahu"},{"last_name":"Qiu","id":"45e99c0d-1eb1-11eb-9b96-ed8ab2983cac","first_name":"Liu","full_name":"Qiu, Liu","orcid":"0000-0003-4345-4267"},{"full_name":"Hease, William J","first_name":"William J","orcid":"0000-0001-9868-2166","id":"29705398-F248-11E8-B48F-1D18A9856A87","last_name":"Hease"},{"last_name":"Arnold","orcid":"0000-0003-1397-7876","full_name":"Arnold, Georg M","first_name":"Georg M","id":"3770C838-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Y.","full_name":"Minoguchi, Y.","last_name":"Minoguchi"},{"full_name":"Rabl, P.","first_name":"P.","last_name":"Rabl"},{"last_name":"Fink","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","first_name":"Johannes M","full_name":"Fink, Johannes M","orcid":"0000-0001-8112-028X"}],"intvolume":"       380","article_type":"original","isi":1,"citation":{"apa":"Sahu, R., Qiu, L., Hease, W. J., Arnold, G. M., Minoguchi, Y., Rabl, P., &#38; Fink, J. M. (2023). Entangling microwaves with light. <i>Science</i>. American Association for the Advancement of Science. <a href=\"https://doi.org/10.1126/science.adg3812\">https://doi.org/10.1126/science.adg3812</a>","ama":"Sahu R, Qiu L, Hease WJ, et al. Entangling microwaves with light. <i>Science</i>. 2023;380(6646):718-721. doi:<a href=\"https://doi.org/10.1126/science.adg3812\">10.1126/science.adg3812</a>","ieee":"R. Sahu <i>et al.</i>, “Entangling microwaves with light,” <i>Science</i>, vol. 380, no. 6646. American Association for the Advancement of Science, pp. 718–721, 2023.","ista":"Sahu R, Qiu L, Hease WJ, Arnold GM, Minoguchi Y, Rabl P, Fink JM. 2023. Entangling microwaves with light. Science. 380(6646), 718–721.","mla":"Sahu, Rishabh, et al. “Entangling Microwaves with Light.” <i>Science</i>, vol. 380, no. 6646, American Association for the Advancement of Science, 2023, pp. 718–21, doi:<a href=\"https://doi.org/10.1126/science.adg3812\">10.1126/science.adg3812</a>.","short":"R. Sahu, L. Qiu, W.J. Hease, G.M. Arnold, Y. Minoguchi, P. Rabl, J.M. Fink, Science 380 (2023) 718–721.","chicago":"Sahu, Rishabh, Liu Qiu, William J Hease, Georg M Arnold, Y. Minoguchi, P. Rabl, and Johannes M Fink. “Entangling Microwaves with Light.” <i>Science</i>. American Association for the Advancement of Science, 2023. <a href=\"https://doi.org/10.1126/science.adg3812\">https://doi.org/10.1126/science.adg3812</a>."},"fulldoi":"https://doi.org/10.1126/science.adg3812","external_id":{"pmid":["37200415"],"arxiv":["2301.03315"],"isi":["000996515200004"]},"corr_author":"1","page":"718-721","publisher":"American Association for the Advancement of Science","date_created":"2023-05-31T11:39:24Z"},{"_id":"13122","year":"2023","department":[{"_id":"JoFi"}],"date_updated":"2026-04-15T06:39:32Z","main_file_link":[{"open_access":"1","url":"https://doi.org/10.5281/zenodo.7789418"}],"date_published":"2023-03-31T00:00:00Z","type":"research_data_reference","related_material":{"record":[{"status":"public","id":"13106","relation":"used_in_publication"}]},"status":"public","oa":1,"title":"Entangling microwaves with light","author":[{"last_name":"Sahu","id":"47D26E34-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6264-2162","full_name":"Sahu, Rishabh","first_name":"Rishabh"}],"day":"31","doi":"10.5281/ZENODO.7789417","citation":{"ieee":"R. Sahu, “Entangling microwaves with light.” Zenodo, 2023.","ista":"Sahu R. 2023. Entangling microwaves with light, Zenodo, <a href=\"https://doi.org/10.5281/ZENODO.7789417\">10.5281/ZENODO.7789417</a>.","apa":"Sahu, R. (2023). Entangling microwaves with light. Zenodo. <a href=\"https://doi.org/10.5281/ZENODO.7789417\">https://doi.org/10.5281/ZENODO.7789417</a>","ama":"Sahu R. Entangling microwaves with light. 2023. doi:<a href=\"https://doi.org/10.5281/ZENODO.7789417\">10.5281/ZENODO.7789417</a>","chicago":"Sahu, Rishabh. “Entangling Microwaves with Light.” Zenodo, 2023. <a href=\"https://doi.org/10.5281/ZENODO.7789417\">https://doi.org/10.5281/ZENODO.7789417</a>.","short":"R. Sahu, (2023).","mla":"Sahu, Rishabh. <i>Entangling Microwaves with Light</i>. Zenodo, 2023, doi:<a href=\"https://doi.org/10.5281/ZENODO.7789417\">10.5281/ZENODO.7789417</a>."},"fulldoi":"https://doi.org/10.5281/ZENODO.7789417","oa_version":"Published Version","abstract":[{"text":"Data for submitted article \"Entangling microwaves with light\" at arXiv:2301.03315v1","lang":"eng"}],"corr_author":"1","publisher":"Zenodo","date_created":"2023-06-06T06:46:16Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_processing_charge":"No","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"month":"03"},{"title":"Tunable directional photon scattering from a pair of superconducting qubits","author":[{"last_name":"Redchenko","first_name":"Elena","full_name":"Redchenko, Elena","id":"2C21D6E8-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Poshakinskiy","first_name":"Alexander","full_name":"Poshakinskiy, Alexander"},{"last_name":"Sett","id":"2E6D040E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-7641-8348","first_name":"Riya","full_name":"Sett, Riya"},{"last_name":"Zemlicka","full_name":"Zemlicka, Martin","first_name":"Martin","orcid":"0009-0005-0878-3032","id":"2DCF8DE6-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Poddubny","full_name":"Poddubny, Alexander","first_name":"Alexander"},{"last_name":"Fink","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","full_name":"Fink, Johannes M","first_name":"Johannes M","orcid":"0000-0001-8112-028X"}],"ddc":["530"],"oa":1,"type":"research_data_reference","related_material":{"record":[{"relation":"used_in_publication","status":"public","id":"13117"}]},"status":"public","date_published":"2023-04-28T00:00:00Z","department":[{"_id":"JoFi"}],"date_updated":"2026-06-03T07:16:05Z","main_file_link":[{"open_access":"1","url":"https://doi.org/10.5281/zenodo.7858567"}],"_id":"13124","year":"2023","month":"04","article_processing_charge":"No","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"date_created":"2023-06-06T07:36:50Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publisher":"Zenodo","abstract":[{"text":"This dataset comprises all data shown in the figures of the submitted article \"Tunable directional photon scattering from a pair of superconducting qubits\" at arXiv:2205.03293. Additional raw data are available from the corresponding author on reasonable request.","lang":"eng"}],"corr_author":"1","citation":{"ama":"Redchenko E, Poshakinskiy A, Sett R, Zemlicka M, Poddubny A, Fink JM. Tunable directional photon scattering from a pair of superconducting qubits. 2023. doi:<a href=\"https://doi.org/10.5281/ZENODO.7858567\">10.5281/ZENODO.7858567</a>","apa":"Redchenko, E., Poshakinskiy, A., Sett, R., Zemlicka, M., Poddubny, A., &#38; Fink, J. M. (2023). Tunable directional photon scattering from a pair of superconducting qubits. Zenodo. <a href=\"https://doi.org/10.5281/ZENODO.7858567\">https://doi.org/10.5281/ZENODO.7858567</a>","ieee":"E. Redchenko, A. Poshakinskiy, R. Sett, M. Zemlicka, A. Poddubny, and J. M. Fink, “Tunable directional photon scattering from a pair of superconducting qubits.” Zenodo, 2023.","ista":"Redchenko E, Poshakinskiy A, Sett R, Zemlicka M, Poddubny A, Fink JM. 2023. Tunable directional photon scattering from a pair of superconducting qubits, Zenodo, <a href=\"https://doi.org/10.5281/ZENODO.7858567\">10.5281/ZENODO.7858567</a>.","mla":"Redchenko, Elena, et al. <i>Tunable Directional Photon Scattering from a Pair of Superconducting Qubits</i>. Zenodo, 2023, doi:<a href=\"https://doi.org/10.5281/ZENODO.7858567\">10.5281/ZENODO.7858567</a>.","chicago":"Redchenko, Elena, Alexander Poshakinskiy, Riya Sett, Martin Zemlicka, Alexander Poddubny, and Johannes M Fink. “Tunable Directional Photon Scattering from a Pair of Superconducting Qubits.” Zenodo, 2023. <a href=\"https://doi.org/10.5281/ZENODO.7858567\">https://doi.org/10.5281/ZENODO.7858567</a>.","short":"E. Redchenko, A. Poshakinskiy, R. Sett, M. Zemlicka, A. Poddubny, J.M. Fink, (2023)."},"oa_version":"Published Version","fulldoi":"https://doi.org/10.5281/ZENODO.7858567","doi":"10.5281/ZENODO.7858567","day":"28"},{"department":[{"_id":"GradSch"},{"_id":"JoFi"}],"date_updated":"2026-04-15T06:43:26Z","language":[{"iso":"eng"}],"ddc":["537","535","539"],"author":[{"last_name":"Sahu","id":"47D26E34-F248-11E8-B48F-1D18A9856A87","full_name":"Sahu, Rishabh","first_name":"Rishabh","orcid":"0000-0001-6264-2162"}],"oa":1,"ec_funded":1,"citation":{"ama":"Sahu R. Cavity quantum electrooptics. 2023. doi:<a href=\"https://doi.org/10.15479/at:ista:13175\">10.15479/at:ista:13175</a>","apa":"Sahu, R. (2023). <i>Cavity quantum electrooptics</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/at:ista:13175\">https://doi.org/10.15479/at:ista:13175</a>","ieee":"R. Sahu, “Cavity quantum electrooptics,” Institute of Science and Technology Austria, 2023.","ista":"Sahu R. 2023. Cavity quantum electrooptics. Institute of Science and Technology Austria.","mla":"Sahu, Rishabh. <i>Cavity Quantum Electrooptics</i>. Institute of Science and Technology Austria, 2023, doi:<a href=\"https://doi.org/10.15479/at:ista:13175\">10.15479/at:ista:13175</a>.","short":"R. Sahu, Cavity Quantum Electrooptics, Institute of Science and Technology Austria, 2023.","chicago":"Sahu, Rishabh. “Cavity Quantum Electrooptics.” Institute of Science and Technology Austria, 2023. <a href=\"https://doi.org/10.15479/at:ista:13175\">https://doi.org/10.15479/at:ista:13175</a>."},"fulldoi":"https://doi.org/10.15479/at:ista:13175","corr_author":"1","page":"202","alternative_title":["ISTA Thesis"],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode","image":"/images/cc_by_nc_sa.png","name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","short":"CC BY-NC-SA (4.0)"},"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"SSU"},{"_id":"NanoFab"}],"publisher":"Institute of Science and Technology Austria","date_created":"2023-06-30T08:07:43Z","date_published":"2023-05-05T00:00:00Z","type":"dissertation","related_material":{"record":[{"id":"12900","status":"public","relation":"old_edition"},{"status":"public","id":"10924","relation":"part_of_dissertation"},{"id":"9114","status":"public","relation":"part_of_dissertation"}]},"status":"public","_id":"13175","file":[{"access_level":"open_access","file_size":18688376,"checksum":"7d03f1a5a5258ee43dfc3323dea4e08f","date_updated":"2023-06-30T08:17:25Z","file_name":"thesis_pdfa.pdf","file_id":"13176","creator":"cchlebak","date_created":"2023-06-30T08:17:25Z","content_type":"application/pdf","relation":"main_file","success":1},{"creator":"cchlebak","file_id":"13196","checksum":"c3b45317ae58e0527533f98c202d81b7","file_name":"thesis.zip","date_updated":"2023-07-06T11:35:15Z","file_size":37847025,"access_level":"closed","relation":"source_file","content_type":"application/x-zip-compressed","date_created":"2023-07-06T11:35:15Z"}],"degree_awarded":"PhD","year":"2023","title":"Cavity quantum electrooptics","OA_place":"publisher","keyword":["quantum optics","electrooptics","quantum networks","quantum communication","transduction"],"oa_version":"Published Version","abstract":[{"lang":"eng","text":"About a 100 years ago, we discovered that our universe is inherently noisy, that is, measuring any physical quantity with a precision beyond a certain point is not possible because of an omnipresent inherent noise. We call this - the quantum noise. Certain physical processes allow this quantum noise to get correlated in conjugate physical variables. These quantum correlations can be used to go beyond the potential of our inherently noisy universe and obtain a quantum advantage over the classical applications. \r\n\r\nQuantum noise being inherent also means that, at the fundamental level, the physical quantities are not well defined and therefore, objects can stay in multiple states at the same time. For example, the position of a particle not being well defined means that the particle is in multiple positions at the same time. About 4 decades ago, we started exploring the possibility of using objects which can be in multiple states at the same time to increase the dimensionality in computation. Thus, the field of quantum computing was born. We discovered that using quantum entanglement, a property closely related to quantum correlations, can be used to speed up computation of certain problems, such as factorisation of large numbers, faster than any known classical algorithm. Thus began the pursuit to make quantum computers a reality. \r\n\r\nTill date, we have explored quantum control over many physical systems including photons, spins, atoms, ions and even simple circuits made up of superconducting material. However, there persists one ubiquitous theme. The more readily a system interacts with an external field or matter, the more easily we can control it. But this also means that such a system can easily interact with a noisy environment and quickly lose its coherence. Consequently, such systems like electron spins need to be protected from the environment to ensure the longevity of their coherence. Other systems like nuclear spins are naturally protected as they do not interact easily with the environment. But, due to the same reason, it is harder to interact with such systems. \r\n\r\nAfter decades of experimentation with various systems, we are convinced that no one type of quantum system would be the best for all the quantum applications. We would need hybrid systems which are all interconnected - much like the current internet where all sorts of devices can all talk to each other - but now for quantum devices. A quantum internet. \r\n\r\nOptical photons are the best contenders to carry information for the quantum internet. They can carry quantum information cheaply and without much loss - the same reasons which has made them the backbone of our current internet. Following this direction, many systems, like trapped ions, have already demonstrated successful quantum links over a large distances using optical photons. However, some of the most promising contenders for quantum computing which are based on microwave frequencies have been left behind. This is because high energy optical photons can adversely affect fragile low-energy microwave systems. \r\n\r\nIn this thesis, we present substantial progress on this missing quantum link between microwave and optics using electrooptical nonlinearities in lithium niobate. The nonlinearities are enhanced by using resonant cavities for all the involved modes leading to observation of strong direct coupling between optical and microwave frequencies. With this strong coupling we are not only able to achieve almost 100\\% internal conversion efficiency with low added noise, thus presenting a quantum-enabled transducer, but also we are able to observe novel effects such as cooling of a microwave mode using optics. The strong coupling regime also leads to direct observation of dynamical backaction effect between microwave and optical frequencies which are studied in detail here. Finally, we also report first observation of microwave-optics entanglement in form of two-mode squeezed vacuum squeezed 0.7dB below vacuum level. \r\nWith this new bridge between microwave and optics, the microwave-based quantum technologies can finally be a part of a quantum network which is based on optical photons - putting us one step closer to a future with quantum internet. "}],"supervisor":[{"last_name":"Fink","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","first_name":"Johannes M","full_name":"Fink, Johannes M","orcid":"0000-0001-8112-028X"}],"file_date_updated":"2023-07-06T11:35:15Z","doi":"10.15479/at:ista:13175","day":"05","article_processing_charge":"No","has_accepted_license":"1","publication_identifier":{"issn":["2663-337X"],"isbn":["978-3-99078-030-5"]},"month":"05","publication_status":"published","project":[{"_id":"26336814-B435-11E9-9278-68D0E5697425","name":"A Fiber Optic Transceiver for Superconducting Qubits","call_identifier":"H2020","grant_number":"758053"},{"_id":"9B868D20-BA93-11EA-9121-9846C619BF3A","name":"Quantum Local Area Networks with Superconducting Qubits","call_identifier":"H2020","grant_number":"899354"},{"grant_number":"F07105","_id":"bdb108fd-d553-11ed-ba76-83dc74a9864f","name":"QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration of Superconducting Quantum Circuits"}],"user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd"},{"oa":1,"arxiv":1,"author":[{"last_name":"Fan","full_name":"Fan, Zhi Yuan","first_name":"Zhi Yuan"},{"full_name":"Qiu, Liu","first_name":"Liu","orcid":"0000-0003-4345-4267","id":"45e99c0d-1eb1-11eb-9b96-ed8ab2983cac","last_name":"Qiu"},{"first_name":"Simon","full_name":"Gröblacher, Simon","last_name":"Gröblacher"},{"first_name":"Jie","full_name":"Li, Jie","last_name":"Li"}],"date_updated":"2025-09-09T13:13:18Z","department":[{"_id":"JoFi"}],"language":[{"iso":"eng"}],"publisher":"Wiley","date_created":"2023-11-05T23:00:54Z","intvolume":"        17","isi":1,"article_type":"original","fulldoi":"https://doi.org/10.1002/lpor.202200866","citation":{"ista":"Fan ZY, Qiu L, Gröblacher S, Li J. 2023. Microwave-optics entanglement via cavity optomagnomechanics. Laser and Photonics Reviews. 17(12), 2200866.","ieee":"Z. Y. Fan, L. Qiu, S. Gröblacher, and J. Li, “Microwave-optics entanglement via cavity optomagnomechanics,” <i>Laser and Photonics Reviews</i>, vol. 17, no. 12. Wiley, 2023.","apa":"Fan, Z. Y., Qiu, L., Gröblacher, S., &#38; Li, J. (2023). Microwave-optics entanglement via cavity optomagnomechanics. <i>Laser and Photonics Reviews</i>. Wiley. <a href=\"https://doi.org/10.1002/lpor.202200866\">https://doi.org/10.1002/lpor.202200866</a>","ama":"Fan ZY, Qiu L, Gröblacher S, Li J. Microwave-optics entanglement via cavity optomagnomechanics. <i>Laser and Photonics Reviews</i>. 2023;17(12). doi:<a href=\"https://doi.org/10.1002/lpor.202200866\">10.1002/lpor.202200866</a>","chicago":"Fan, Zhi Yuan, Liu Qiu, Simon Gröblacher, and Jie Li. “Microwave-Optics Entanglement via Cavity Optomagnomechanics.” <i>Laser and Photonics Reviews</i>. Wiley, 2023. <a href=\"https://doi.org/10.1002/lpor.202200866\">https://doi.org/10.1002/lpor.202200866</a>.","short":"Z.Y. Fan, L. Qiu, S. Gröblacher, J. Li, Laser and Photonics Reviews 17 (2023).","mla":"Fan, Zhi Yuan, et al. “Microwave-Optics Entanglement via Cavity Optomagnomechanics.” <i>Laser and Photonics Reviews</i>, vol. 17, no. 12, 2200866, Wiley, 2023, doi:<a href=\"https://doi.org/10.1002/lpor.202200866\">10.1002/lpor.202200866</a>."},"external_id":{"isi":["001088860000001"],"arxiv":["2208.10703"]},"scopus_import":"1","title":"Microwave-optics entanglement via cavity optomagnomechanics","year":"2023","_id":"14489","article_number":"2200866","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2208.10703"}],"acknowledgement":"This work was supported by the National Key Research and Development Program of China (Grant no. 2022YFA1405200), the National Natural Science Foundation of China (Nos. 92265202), and the European Research Council (ERC CoG Q-ECHOS, 101001005).","date_published":"2023-12-01T00:00:00Z","status":"public","type":"journal_article","publication_status":"published","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","publication_identifier":{"issn":["1863-8880"],"eissn":["1863-8899"]},"article_processing_charge":"No","quality_controlled":"1","month":"12","volume":17,"publication":"Laser and Photonics Reviews","issue":"12","doi":"10.1002/lpor.202200866","day":"01","oa_version":"Preprint","abstract":[{"text":"Microwave-optics entanglement is a vital component for building hybrid quantum networks. Here, a new mechanism for preparing stationary entanglement between microwave and optical cavity fields in a cavity optomagnomechanical system is proposed. It consists of a magnon mode in a ferrimagnetic crystal that couples directly to a microwave cavity mode via the magnetic dipole interaction and indirectly to an optical cavity through the deformation displacement of the crystal. The mechanical displacement is induced by the magnetostrictive force and coupled to the optical cavity via radiation pressure. Both the opto- and magnomechanical couplings are dispersive. Magnon–phonon entanglement is created via magnomechanical parametric down-conversion, which is further distributed to optical and microwave photons via simultaneous optomechanical beamsplitter interaction and electromagnonic state-swap interaction, yielding stationary microwave-optics entanglement. The microwave-optics entanglement is robust against thermal noise, which will find broad potential applications in quantum networks and quantum information processing with hybrid quantum systems.","lang":"eng"}]},{"external_id":{"arxiv":["2206.14104"],"isi":["001095315600001"]},"corr_author":"1","fulldoi":"https://doi.org/10.1103/PhysRevApplied.20.044054","citation":{"ieee":"M. Zemlicka <i>et al.</i>, “Compact vacuum-gap transmon qubits: Selective and sensitive probes for superconductor surface losses,” <i>Physical Review Applied</i>, vol. 20, no. 4. American Physical Society, 2023.","ista":"Zemlicka M, Redchenko E, Peruzzo M, Hassani F, Trioni A, Barzanjeh S, Fink JM. 2023. Compact vacuum-gap transmon qubits: Selective and sensitive probes for superconductor surface losses. Physical Review Applied. 20(4), 044054.","apa":"Zemlicka, M., Redchenko, E., Peruzzo, M., Hassani, F., Trioni, A., Barzanjeh, S., &#38; Fink, J. M. (2023). Compact vacuum-gap transmon qubits: Selective and sensitive probes for superconductor surface losses. <i>Physical Review Applied</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevApplied.20.044054\">https://doi.org/10.1103/PhysRevApplied.20.044054</a>","ama":"Zemlicka M, Redchenko E, Peruzzo M, et al. Compact vacuum-gap transmon qubits: Selective and sensitive probes for superconductor surface losses. <i>Physical Review Applied</i>. 2023;20(4). doi:<a href=\"https://doi.org/10.1103/PhysRevApplied.20.044054\">10.1103/PhysRevApplied.20.044054</a>","short":"M. Zemlicka, E. Redchenko, M. Peruzzo, F. Hassani, A. Trioni, S. Barzanjeh, J.M. Fink, Physical Review Applied 20 (2023).","chicago":"Zemlicka, Martin, Elena Redchenko, Matilda Peruzzo, Farid Hassani, Andrea Trioni, Shabir Barzanjeh, and Johannes M Fink. “Compact Vacuum-Gap Transmon Qubits: Selective and Sensitive Probes for Superconductor Surface Losses.” <i>Physical Review Applied</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/PhysRevApplied.20.044054\">https://doi.org/10.1103/PhysRevApplied.20.044054</a>.","mla":"Zemlicka, Martin, et al. “Compact Vacuum-Gap Transmon Qubits: Selective and Sensitive Probes for Superconductor Surface Losses.” <i>Physical Review Applied</i>, vol. 20, no. 4, 044054, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/PhysRevApplied.20.044054\">10.1103/PhysRevApplied.20.044054</a>."},"isi":1,"article_type":"original","intvolume":"        20","date_created":"2023-11-12T23:00:55Z","publisher":"American Physical Society","acknowledged_ssus":[{"_id":"NanoFab"}],"date_updated":"2026-06-03T07:16:02Z","department":[{"_id":"JoFi"}],"language":[{"iso":"eng"}],"author":[{"orcid":"0009-0005-0878-3032","first_name":"Martin","full_name":"Zemlicka, Martin","id":"2DCF8DE6-F248-11E8-B48F-1D18A9856A87","last_name":"Zemlicka"},{"id":"2C21D6E8-F248-11E8-B48F-1D18A9856A87","first_name":"Elena","full_name":"Redchenko, Elena","last_name":"Redchenko"},{"id":"3F920B30-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-3415-4628","full_name":"Peruzzo, Matilda","first_name":"Matilda","last_name":"Peruzzo"},{"orcid":"0000-0001-6937-5773","full_name":"Hassani, Farid","first_name":"Farid","id":"2AED110C-F248-11E8-B48F-1D18A9856A87","last_name":"Hassani"},{"last_name":"Trioni","first_name":"Andrea","full_name":"Trioni, Andrea","id":"42F71B44-F248-11E8-B48F-1D18A9856A87"},{"id":"2D25E1F6-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-0415-1423","full_name":"Barzanjeh, Shabir","first_name":"Shabir","last_name":"Barzanjeh"},{"last_name":"Fink","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","first_name":"Johannes M","full_name":"Fink, Johannes M","orcid":"0000-0001-8112-028X"}],"ec_funded":1,"oa":1,"arxiv":1,"abstract":[{"lang":"eng","text":"State-of-the-art transmon qubits rely on large capacitors, which systematically improve their coherence due to reduced surface-loss participation. However, this approach increases both the footprint and the parasitic cross-coupling and is ultimately limited by radiation losses—a potential roadblock for scaling up quantum processors to millions of qubits. In this work we present transmon qubits with sizes as low as 36 × 39 µm2 with  100-nm-wide vacuum-gap capacitors that are micromachined from commercial silicon-on-insulator wafers and shadow evaporated with aluminum. We achieve a vacuum participation ratio up to 99.6% in an in-plane design that is compatible with standard coplanar circuits. Qubit relaxationtime measurements for small gaps with high zero-point electric field variance of up to 22 V/m reveal a double exponential decay indicating comparably strong qubit interaction with long-lived two-level systems. The exceptionally high selectivity of up to 20 dB to the superconductor-vacuum interface allows us to precisely back out the sub-single-photon dielectric loss tangent of aluminum oxide previously exposed to ambient conditions. In terms of future scaling potential, we achieve a ratio of qubit quality factor to a footprint area equal to 20 µm−2, which is comparable with the highest T1 devices relying on larger geometries, a value that could improve substantially for lower surface-loss superconductors. "}],"oa_version":"Preprint","day":"20","doi":"10.1103/PhysRevApplied.20.044054","publication":"Physical Review Applied","volume":20,"issue":"4","quality_controlled":"1","month":"10","publication_identifier":{"eissn":["2331-7019"]},"article_processing_charge":"No","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","project":[{"name":"A Fiber Optic Transceiver for Superconducting Qubits","_id":"26336814-B435-11E9-9278-68D0E5697425","grant_number":"758053","call_identifier":"H2020"},{"name":"Protected states of quantum matter","_id":"eb9b30ac-77a9-11ec-83b8-871f581d53d2"},{"_id":"258047B6-B435-11E9-9278-68D0E5697425","name":"Microwave-to-Optical Quantum Link: Quantum Teleportation and Quantum Illumination with cavity Optomechanics","call_identifier":"H2020","grant_number":"707438"},{"grant_number":"101080139","name":"Open Superconducting Quantum Computers (OpenSuperQPlus)","_id":"bdb7cfc1-d553-11ed-ba76-d2eaab167738"},{"grant_number":"F07105","_id":"bdb108fd-d553-11ed-ba76-83dc74a9864f","name":"QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration of Superconducting Quantum Circuits"}],"publication_status":"published","status":"public","related_material":{"record":[{"id":"14520","status":"public","relation":"research_data"}]},"type":"journal_article","date_published":"2023-10-20T00:00:00Z","acknowledgement":"This work was supported by the Austrian Science Fund (FWF) through BeyondC (F7105), the European Research Council under Grant Agreement No. 758053 (ERC StG QUNNECT) and a NOMIS foundation research grant. M.Z. was the recipient of a SAIA scholarship, E.R. of\r\na DOC fellowship of the Austrian Academy of Sciences, and M.P. of a Pöttinger scholarship at IST Austria. S.B. acknowledges support from Marie Skłodowska Curie Program No. 707438 (MSC-IF SUPEREOM). J.M.F. acknowledges support from the Horizon Europe Program HORIZON-CL4-2022-QUANTUM-01-SGA via Project No. 101113946 OpenSuperQPlus100 and the ISTA Nanofabrication Facility.","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2206.14104"}],"year":"2023","_id":"14517","article_number":"044054","title":"Compact vacuum-gap transmon qubits: Selective and sensitive probes for superconductor surface losses","scopus_import":"1"},{"department":[{"_id":"JoFi"}],"language":[{"iso":"eng"}],"date_updated":"2024-10-09T21:07:19Z","arxiv":1,"oa":1,"author":[{"id":"c1bea5e1-878e-11ee-9dff-d7404e4422ab","first_name":"Ekaterina","full_name":"Fedotova, Ekaterina","orcid":"0000-0001-7242-015X","last_name":"Fedotova"},{"first_name":"Nikolai","full_name":"Kuznetsov, Nikolai","last_name":"Kuznetsov"},{"first_name":"Egor","full_name":"Tiunov, Egor","last_name":"Tiunov"},{"last_name":"Ulanov","first_name":"A. E.","full_name":"Ulanov, A. E."},{"last_name":"Lvovsky","first_name":"A. I.","full_name":"Lvovsky, A. I."}],"intvolume":"       108","article_type":"original","citation":{"apa":"Fedotova, E., Kuznetsov, N., Tiunov, E., Ulanov, A. E., &#38; Lvovsky, A. I. (2023). Continuous-variable quantum tomography of high-amplitude states. <i>Physical Review A</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevA.108.042430\">https://doi.org/10.1103/PhysRevA.108.042430</a>","ama":"Fedotova E, Kuznetsov N, Tiunov E, Ulanov AE, Lvovsky AI. Continuous-variable quantum tomography of high-amplitude states. <i>Physical Review A</i>. 2023;108(4). doi:<a href=\"https://doi.org/10.1103/PhysRevA.108.042430\">10.1103/PhysRevA.108.042430</a>","ieee":"E. Fedotova, N. Kuznetsov, E. Tiunov, A. E. Ulanov, and A. I. Lvovsky, “Continuous-variable quantum tomography of high-amplitude states,” <i>Physical Review A</i>, vol. 108, no. 4. American Physical Society, 2023.","ista":"Fedotova E, Kuznetsov N, Tiunov E, Ulanov AE, Lvovsky AI. 2023. Continuous-variable quantum tomography of high-amplitude states. Physical Review A. 108(4), 042430.","mla":"Fedotova, Ekaterina, et al. “Continuous-Variable Quantum Tomography of High-Amplitude States.” <i>Physical Review A</i>, vol. 108, no. 4, 042430, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/PhysRevA.108.042430\">10.1103/PhysRevA.108.042430</a>.","chicago":"Fedotova, Ekaterina, Nikolai Kuznetsov, Egor Tiunov, A. E. Ulanov, and A. I. Lvovsky. “Continuous-Variable Quantum Tomography of High-Amplitude States.” <i>Physical Review A</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/PhysRevA.108.042430\">https://doi.org/10.1103/PhysRevA.108.042430</a>.","short":"E. Fedotova, N. Kuznetsov, E. Tiunov, A.E. Ulanov, A.I. Lvovsky, Physical Review A 108 (2023)."},"fulldoi":"https://doi.org/10.1103/PhysRevA.108.042430","corr_author":"1","external_id":{"arxiv":["2212.07406"]},"publisher":"American Physical Society","date_created":"2023-11-19T23:00:54Z","_id":"14553","article_number":"042430","year":"2023","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2212.07406"}],"date_published":"2023-10-30T00:00:00Z","type":"journal_article","status":"public","scopus_import":"1","title":"Continuous-variable quantum tomography of high-amplitude states","issue":"4","volume":108,"publication":"Physical Review A","day":"30","doi":"10.1103/PhysRevA.108.042430","oa_version":"Preprint","abstract":[{"text":"Quantum state tomography is an essential component of modern quantum technology. In application to continuous-variable harmonic-oscillator systems, such as the electromagnetic field, existing tomography methods typically reconstruct the state in discrete bases, and are hence limited to states with relatively low amplitudes and energies. Here, we overcome this limitation by utilizing a feed-forward neural network to obtain the density matrix directly in the continuous position basis. An important benefit of our approach is the ability to choose specific regions in the phase space for detailed reconstruction. This results in a relatively slow scaling of the amount of resources required for the reconstruction with the state amplitude, and hence allows us to dramatically increase the range of amplitudes accessible with our method.","lang":"eng"}],"publication_status":"published","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_processing_charge":"No","publication_identifier":{"issn":["2469-9926"],"eissn":["2469-9934"]},"month":"10","quality_controlled":"1"},{"quality_controlled":"1","month":"10","publication_identifier":{"isbn":["9781957171296"]},"article_processing_charge":"No","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_created":"2024-01-22T12:29:41Z","publisher":"Optica Publishing Group","publication_status":"published","corr_author":"1","abstract":[{"text":"We entangled microwave and optical photons for the first time as verified by a measured two-mode vacuum squeezing of 0.7 dB. This electro-optic entanglement is the key resource needed to connect cryogenic quantum circuits.","lang":"eng"}],"fulldoi":"https://doi.org/10.1364/ls.2023.lm1f.3","oa_version":"None","citation":{"ista":"Sahu R, Qiu L, Hease WJ, Arnold GM, Minoguchi Y, Rabl P, Fink JM. 2023. Entangling microwaves and telecom wavelength light. Frontiers in Optics + Laser Science 2023. Laser Science, LM1F.3.","ieee":"R. Sahu <i>et al.</i>, “Entangling microwaves and telecom wavelength light,” in <i>Frontiers in Optics + Laser Science 2023</i>, Tacoma, WA, United States, 2023.","apa":"Sahu, R., Qiu, L., Hease, W. J., Arnold, G. M., Minoguchi, Y., Rabl, P., &#38; Fink, J. M. (2023). Entangling microwaves and telecom wavelength light. In <i>Frontiers in Optics + Laser Science 2023</i>. Tacoma, WA, United States: Optica Publishing Group. <a href=\"https://doi.org/10.1364/ls.2023.lm1f.3\">https://doi.org/10.1364/ls.2023.lm1f.3</a>","ama":"Sahu R, Qiu L, Hease WJ, et al. Entangling microwaves and telecom wavelength light. In: <i>Frontiers in Optics + Laser Science 2023</i>. Optica Publishing Group; 2023. doi:<a href=\"https://doi.org/10.1364/ls.2023.lm1f.3\">10.1364/ls.2023.lm1f.3</a>","short":"R. Sahu, L. Qiu, W.J. Hease, G.M. Arnold, Y. Minoguchi, P. Rabl, J.M. Fink, in:, Frontiers in Optics + Laser Science 2023, Optica Publishing Group, 2023.","chicago":"Sahu, Rishabh, Liu Qiu, William J Hease, Georg M Arnold, Yuri Minoguchi, Peter Rabl, and Johannes M Fink. “Entangling Microwaves and Telecom Wavelength Light.” In <i>Frontiers in Optics + Laser Science 2023</i>. Optica Publishing Group, 2023. <a href=\"https://doi.org/10.1364/ls.2023.lm1f.3\">https://doi.org/10.1364/ls.2023.lm1f.3</a>.","mla":"Sahu, Rishabh, et al. “Entangling Microwaves and Telecom Wavelength Light.” <i>Frontiers in Optics + Laser Science 2023</i>, LM1F.3, Optica Publishing Group, 2023, doi:<a href=\"https://doi.org/10.1364/ls.2023.lm1f.3\">10.1364/ls.2023.lm1f.3</a>."},"doi":"10.1364/ls.2023.lm1f.3","day":"01","publication":"Frontiers in Optics + Laser Science 2023","author":[{"orcid":"0000-0001-6264-2162","first_name":"Rishabh","full_name":"Sahu, Rishabh","id":"47D26E34-F248-11E8-B48F-1D18A9856A87","last_name":"Sahu"},{"last_name":"Qiu","first_name":"Liu","full_name":"Qiu, Liu"},{"orcid":"0000-0001-9868-2166","full_name":"Hease, William J","first_name":"William J","id":"29705398-F248-11E8-B48F-1D18A9856A87","last_name":"Hease"},{"last_name":"Arnold","orcid":"0000-0003-1397-7876","full_name":"Arnold, Georg M","first_name":"Georg M","id":"3770C838-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Minoguchi, Yuri","first_name":"Yuri","last_name":"Minoguchi"},{"last_name":"Rabl","full_name":"Rabl, Peter","first_name":"Peter"},{"id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","full_name":"Fink, Johannes M","first_name":"Johannes M","orcid":"0000-0001-8112-028X","last_name":"Fink"}],"title":"Entangling microwaves and telecom wavelength light","status":"public","type":"conference","conference":{"start_date":"2023-10-09","end_date":"2023-10-12","name":"Laser Science","location":"Tacoma, WA, United States"},"date_published":"2023-10-01T00:00:00Z","department":[{"_id":"JoFi"}],"date_updated":"2024-10-09T21:07:59Z","language":[{"iso":"eng"}],"year":"2023","article_number":"LM1F.3","_id":"14872"},{"_id":"13227","article_number":"3968","year":"2023","file":[{"creator":"dernst","file_size":2899592,"date_updated":"2023-07-18T08:43:07Z","file_name":"2023_NatureComm_Hassani.pdf","file_id":"13248","checksum":"a85773b5fe23516f60f7d5d31b55c200","access_level":"open_access","success":1,"relation":"main_file","date_created":"2023-07-18T08:43:07Z","content_type":"application/pdf"}],"acknowledgement":"The authors thank J. Koch for discussions and support with the scQubits python package, I. Rozhansky and A. Poddubny for important insights into photon-assisted tunneling, S. Barzanjeh and G. Arnold for theory, E. Redchenko, S. Pepic, the MIBA workshop and the IST nanofabrication facility for technical contributions, as well as L. Drmic, P. Zielinski and R. Sett for software development. We acknowledge the prompt support of Quantum Machines to implement active state preparation with their OPX+. This work was supported by a NOMIS foundation research grant (J.F.), the Austrian Science Fund (FWF) through BeyondC F7105 (J.F.) and IST Austria.","date_published":"2023-07-05T00:00:00Z","type":"journal_article","related_material":{"record":[{"id":"17133","status":"public","relation":"dissertation_contains"}]},"status":"public","scopus_import":"1","title":"Inductively shunted transmons exhibit noise insensitive plasmon states and a fluxon decay exceeding 3 hours","volume":14,"publication":"Nature Communications","file_date_updated":"2023-07-18T08:43:07Z","doi":"10.1038/s41467-023-39656-2","day":"05","oa_version":"Published Version","abstract":[{"text":"Currently available quantum processors are dominated by noise, which severely limits their applicability and motivates the search for new physical qubit encodings. In this work, we introduce the inductively shunted transmon, a weakly flux-tunable superconducting qubit that offers charge offset protection for all levels and a 20-fold reduction in flux dispersion compared to the state-of-the-art resulting in a constant coherence over a full flux quantum. The parabolic confinement provided by the inductive shunt as well as the linearity of the geometric superinductor facilitates a high-power readout that resolves quantum jumps with a fidelity and QND-ness of >90% and without the need for a Josephson parametric amplifier. Moreover, the device reveals quantum tunneling physics between the two prepared fluxon ground states with a measured average decay time of up to 3.5 h. In the future, fast time-domain control of the transition matrix elements could offer a new path forward to also achieve full qubit control in the decay-protected fluxon basis.","lang":"eng"}],"pmid":1,"publication_status":"published","project":[{"_id":"2622978C-B435-11E9-9278-68D0E5697425","name":"Hybrid Semiconductor - Superconductor Quantum Devices"},{"name":"QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration of Superconducting Quantum Circuits","_id":"bdb108fd-d553-11ed-ba76-83dc74a9864f","grant_number":"F07105"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","has_accepted_license":"1","article_processing_charge":"No","publication_identifier":{"eissn":["2041-1723"]},"month":"07","quality_controlled":"1","department":[{"_id":"JoFi"}],"language":[{"iso":"eng"}],"date_updated":"2026-10-02T11:28:16Z","oa":1,"ddc":["530"],"author":[{"last_name":"Hassani","first_name":"Farid","full_name":"Hassani, Farid","orcid":"0000-0001-6937-5773","id":"2AED110C-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Peruzzo","id":"3F920B30-F248-11E8-B48F-1D18A9856A87","full_name":"Peruzzo, Matilda","first_name":"Matilda","orcid":"0000-0002-3415-4628"},{"full_name":"Kapoor, Lucky","first_name":"Lucky","orcid":"0000-0001-8319-2148","id":"84b9700b-15b2-11ec-abd3-831089e67615","last_name":"Kapoor"},{"first_name":"Andrea","full_name":"Trioni, Andrea","id":"42F71B44-F248-11E8-B48F-1D18A9856A87","last_name":"Trioni"},{"orcid":"0009-0005-0878-3032","first_name":"Martin","full_name":"Zemlicka, Martin","id":"2DCF8DE6-F248-11E8-B48F-1D18A9856A87","last_name":"Zemlicka"},{"id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","first_name":"Johannes M","full_name":"Fink, Johannes M","orcid":"0000-0001-8112-028X","last_name":"Fink"}],"intvolume":"        14","article_type":"original","isi":1,"citation":{"mla":"Hassani, Farid, et al. “Inductively Shunted Transmons Exhibit Noise Insensitive Plasmon States and a Fluxon Decay Exceeding 3 Hours.” <i>Nature Communications</i>, vol. 14, 3968, Springer Nature, 2023, doi:<a href=\"https://doi.org/10.1038/s41467-023-39656-2\">10.1038/s41467-023-39656-2</a>.","short":"F. Hassani, M. Peruzzo, L. Kapoor, A. Trioni, M. Zemlicka, J.M. Fink, Nature Communications 14 (2023).","chicago":"Hassani, Farid, Matilda Peruzzo, Lucky Kapoor, Andrea Trioni, Martin Zemlicka, and Johannes M Fink. “Inductively Shunted Transmons Exhibit Noise Insensitive Plasmon States and a Fluxon Decay Exceeding 3 Hours.” <i>Nature Communications</i>. Springer Nature, 2023. <a href=\"https://doi.org/10.1038/s41467-023-39656-2\">https://doi.org/10.1038/s41467-023-39656-2</a>.","apa":"Hassani, F., Peruzzo, M., Kapoor, L., Trioni, A., Zemlicka, M., &#38; Fink, J. M. (2023). Inductively shunted transmons exhibit noise insensitive plasmon states and a fluxon decay exceeding 3 hours. <i>Nature Communications</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41467-023-39656-2\">https://doi.org/10.1038/s41467-023-39656-2</a>","ama":"Hassani F, Peruzzo M, Kapoor L, Trioni A, Zemlicka M, Fink JM. Inductively shunted transmons exhibit noise insensitive plasmon states and a fluxon decay exceeding 3 hours. <i>Nature Communications</i>. 2023;14. doi:<a href=\"https://doi.org/10.1038/s41467-023-39656-2\">10.1038/s41467-023-39656-2</a>","ista":"Hassani F, Peruzzo M, Kapoor L, Trioni A, Zemlicka M, Fink JM. 2023. Inductively shunted transmons exhibit noise insensitive plasmon states and a fluxon decay exceeding 3 hours. Nature Communications. 14, 3968.","ieee":"F. Hassani, M. Peruzzo, L. Kapoor, A. Trioni, M. Zemlicka, and J. M. Fink, “Inductively shunted transmons exhibit noise insensitive plasmon states and a fluxon decay exceeding 3 hours,” <i>Nature Communications</i>, vol. 14. Springer Nature, 2023."},"fulldoi":"https://doi.org/10.1038/s41467-023-39656-2","corr_author":"1","external_id":{"isi":["001024729900009"],"pmid":["37407570"]},"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"publisher":"Springer Nature","date_created":"2023-07-16T22:01:08Z","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"}},{"date_created":"2023-07-09T22:01:11Z","DOAJ_listed":"1","publisher":"Nature Research","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"article_type":"original","isi":1,"intvolume":"        14","external_id":{"isi":["001018100800002"],"pmid":["37355691"],"arxiv":["2210.12443"]},"corr_author":"1","citation":{"ieee":"L. Qiu, R. Sahu, W. J. Hease, G. M. Arnold, and J. M. Fink, “Coherent optical control of a superconducting microwave cavity via electro-optical dynamical back-action,” <i>Nature Communications</i>, vol. 14. Nature Research, 2023.","ista":"Qiu L, Sahu R, Hease WJ, Arnold GM, Fink JM. 2023. Coherent optical control of a superconducting microwave cavity via electro-optical dynamical back-action. Nature Communications. 14, 3784.","apa":"Qiu, L., Sahu, R., Hease, W. J., Arnold, G. M., &#38; Fink, J. M. (2023). Coherent optical control of a superconducting microwave cavity via electro-optical dynamical back-action. <i>Nature Communications</i>. Nature Research. <a href=\"https://doi.org/10.1038/s41467-023-39493-3\">https://doi.org/10.1038/s41467-023-39493-3</a>","ama":"Qiu L, Sahu R, Hease WJ, Arnold GM, Fink JM. Coherent optical control of a superconducting microwave cavity via electro-optical dynamical back-action. <i>Nature Communications</i>. 2023;14. doi:<a href=\"https://doi.org/10.1038/s41467-023-39493-3\">10.1038/s41467-023-39493-3</a>","chicago":"Qiu, Liu, Rishabh Sahu, William J Hease, Georg M Arnold, and Johannes M Fink. “Coherent Optical Control of a Superconducting Microwave Cavity via Electro-Optical Dynamical Back-Action.” <i>Nature Communications</i>. Nature Research, 2023. <a href=\"https://doi.org/10.1038/s41467-023-39493-3\">https://doi.org/10.1038/s41467-023-39493-3</a>.","short":"L. Qiu, R. Sahu, W.J. Hease, G.M. Arnold, J.M. Fink, Nature Communications 14 (2023).","mla":"Qiu, Liu, et al. “Coherent Optical Control of a Superconducting Microwave Cavity via Electro-Optical Dynamical Back-Action.” <i>Nature Communications</i>, vol. 14, 3784, Nature Research, 2023, doi:<a href=\"https://doi.org/10.1038/s41467-023-39493-3\">10.1038/s41467-023-39493-3</a>."},"fulldoi":"https://doi.org/10.1038/s41467-023-39493-3","ec_funded":1,"oa":1,"arxiv":1,"author":[{"orcid":"0000-0003-4345-4267","full_name":"Qiu, Liu","first_name":"Liu","id":"45e99c0d-1eb1-11eb-9b96-ed8ab2983cac","last_name":"Qiu"},{"orcid":"0000-0001-6264-2162","full_name":"Sahu, Rishabh","first_name":"Rishabh","id":"47D26E34-F248-11E8-B48F-1D18A9856A87","last_name":"Sahu"},{"id":"29705398-F248-11E8-B48F-1D18A9856A87","full_name":"Hease, William J","first_name":"William J","orcid":"0000-0001-9868-2166","last_name":"Hease"},{"last_name":"Arnold","orcid":"0000-0003-1397-7876","first_name":"Georg M","full_name":"Arnold, Georg M","id":"3770C838-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Fink","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","first_name":"Johannes M","full_name":"Fink, Johannes M","orcid":"0000-0001-8112-028X"}],"ddc":["000"],"language":[{"iso":"eng"}],"department":[{"_id":"JoFi"}],"date_updated":"2026-11-08T23:30:30Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","project":[{"name":"A Fiber Optic Transceiver for Superconducting Qubits","_id":"26336814-B435-11E9-9278-68D0E5697425","grant_number":"758053","call_identifier":"H2020"},{"_id":"9B868D20-BA93-11EA-9121-9846C619BF3A","name":"Quantum Local Area Networks with Superconducting Qubits","call_identifier":"H2020","grant_number":"899354"},{"_id":"bdb108fd-d553-11ed-ba76-83dc74a9864f","name":"QUANTUM INFORMATION SYSTEMS BEYOND CLASSICAL CAPABILITIES / P5- Integration of Superconducting Quantum Circuits","grant_number":"F07105"},{"call_identifier":"H2020","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425","name":"ISTplus - Postdoctoral Fellowships"},{"_id":"25681D80-B435-11E9-9278-68D0E5697425","name":"International IST Postdoc Fellowship Programme","call_identifier":"FP7","grant_number":"291734"},{"name":"Coherent on-chip conversion of superconducting qubit signals from microwaves to optical frequencies","_id":"2671EB66-B435-11E9-9278-68D0E5697425"},{"call_identifier":"FWF","name":"FWF Open Access Fund","_id":"3AC91DDA-15DF-11EA-824D-93A3E7B544D1"}],"pmid":1,"publication_status":"published","month":"06","quality_controlled":"1","article_processing_charge":"Yes","has_accepted_license":"1","publication_identifier":{"eissn":["2041-1723"]},"doi":"10.1038/s41467-023-39493-3","day":"24","publication":"Nature Communications","volume":14,"file_date_updated":"2023-07-10T10:10:54Z","APC_amount":"6228 EUR","abstract":[{"text":"Recent quantum technologies have established precise quantum control of various microscopic systems using electromagnetic waves. Interfaces based on cryogenic cavity electro-optic systems are particularly promising, due to the direct interaction between microwave and optical fields in the quantum regime. Quantum optical control of superconducting microwave circuits has been precluded so far due to the weak electro-optical coupling as well as quasi-particles induced by the pump laser. Here we report the coherent control of a superconducting microwave cavity using laser pulses in a multimode electro-optical device at millikelvin temperature with near-unity cooperativity. Both the stationary and instantaneous responses of the microwave and optical modes comply with the coherent electro-optical interaction, and reveal only minuscule amount of excess back-action with an unanticipated time delay. Our demonstration enables wide ranges of applications beyond quantum transductions, from squeezing and quantum non-demolition measurements of microwave fields, to entanglement generation and hybrid quantum networks.","lang":"eng"}],"oa_version":"Published Version","OA_type":"gold","title":"Coherent optical control of a superconducting microwave cavity via electro-optical dynamical back-action","OA_place":"publisher","scopus_import":"1","article_number":"3784","_id":"13200","year":"2023","file":[{"access_level":"open_access","file_size":1349134,"file_id":"13206","date_updated":"2023-07-10T10:10:54Z","file_name":"2023_NatureComms_Qiu.pdf","checksum":"ec7ccd2c08f90d59cab302fd0d7776a4","creator":"alisjak","date_created":"2023-07-10T10:10:54Z","content_type":"application/pdf","relation":"main_file","success":1}],"related_material":{"record":[{"relation":"dissertation_contains","id":"18871","status":"public"}]},"type":"journal_article","status":"public","date_published":"2023-06-24T00:00:00Z","acknowledgement":"This work was supported by the European Research Council under grant agreement no. 758053 (ERC StG QUNNECT), the European Union’s Horizon 2020 research and innovation program under grant agreement no. 899354 (FETopen SuperQuLAN), and the Austrian Science Fund (FWF) through BeyondC (F7105). L.Q. acknowledges generous support from the ISTFELLOW programme. W.H. is the recipient of an ISTplus postdoctoral fellowship with funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement no. 754411. G.A. is the recipient of a DOC fellowship of the Austrian Academy of Sciences at IST Austria."}]