{"OA_place":"publisher","DOAJ_listed":"1","related_material":{"record":[{"id":"18144","status":"public","relation":"earlier_version"},{"relation":"research_data","status":"public","id":"18886"}]},"doi":"10.1038/s41467-025-57252-4","publication":"Nature Communications","oa":1,"type":"journal_article","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"citation":{"ama":"Janik M, Roux KER, Borja Espinosa CN, et al. Strong charge-photon coupling in planar germanium enabled by granular aluminium superinductors. <i>Nature Communications</i>. 2025;16. doi:<a href=\"https://doi.org/10.1038/s41467-025-57252-4\">10.1038/s41467-025-57252-4</a>","short":"M. Janik, K.E.R. Roux, C.N. Borja Espinosa, O. Sagi, A. Baghdadi, T. Adletzberger, S. Calcaterra, M. Botifoll, A. Garzón Manjón, J. Arbiol, D. Chrastina, G. Isella, I.M. Pop, G. Katsaros, Nature Communications 16 (2025).","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>Nature Communications</i>. Springer Nature, 2025. <a href=\"https://doi.org/10.1038/s41467-025-57252-4\">https://doi.org/10.1038/s41467-025-57252-4</a>.","ieee":"M. Janik <i>et al.</i>, “Strong charge-photon coupling in planar germanium enabled by granular aluminium superinductors,” <i>Nature Communications</i>, vol. 16. Springer Nature, 2025.","ista":"Janik M, Roux KER, Borja Espinosa CN, Sagi O, Baghdadi A, Adletzberger T, Calcaterra S, Botifoll M, Garzón Manjón A, Arbiol J, Chrastina D, Isella G, Pop IM, Katsaros G. 2025. Strong charge-photon coupling in planar germanium enabled by granular aluminium superinductors. Nature Communications. 16, 2103.","mla":"Janik, Marian, et al. “Strong Charge-Photon Coupling in Planar Germanium Enabled by Granular Aluminium Superinductors.” <i>Nature Communications</i>, vol. 16, 2103, Springer Nature, 2025, doi:<a href=\"https://doi.org/10.1038/s41467-025-57252-4\">10.1038/s41467-025-57252-4</a>.","apa":"Janik, M., Roux, K. E. R., Borja Espinosa, C. N., Sagi, O., Baghdadi, A., Adletzberger, T., … Katsaros, G. (2025). Strong charge-photon coupling in planar germanium enabled by granular aluminium superinductors. <i>Nature Communications</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41467-025-57252-4\">https://doi.org/10.1038/s41467-025-57252-4</a>"},"ddc":["530"],"year":"2025","ec_funded":1,"day":"01","project":[{"_id":"34c0acea-11ca-11ed-8bc3-8775e10fd452","name":"Integrated GermaNIum quanTum tEchnology","grant_number":"101069515"},{"grant_number":"P32235","name":"Towards scalable hut wire quantum devices","call_identifier":"FWF","_id":"237B3DA4-32DE-11EA-91FC-C7463DDC885E"},{"name":"High impedance circuit quantum electrodynamics with hole spins","grant_number":"I05060","_id":"c0977eea-5a5b-11eb-8a69-a862db0cf4d1"},{"_id":"bd8bd29e-d553-11ed-ba76-f0070d4b237a","name":"Merging spin and superconducting qubits in planar Ge","grant_number":"P36507"},{"_id":"fc2ed2f7-9c52-11eb-aca3-c01059dda49c","name":"IST-BRIDGE: International postdoctoral program","call_identifier":"H2020","grant_number":"101034413"}],"quality_controlled":"1","title":"Strong charge-photon coupling in planar germanium enabled by granular aluminium superinductors","_id":"19401","publisher":"Springer Nature","article_number":"2103","corr_author":"1","volume":16,"external_id":{"arxiv":["2407.03079"]},"article_type":"original","date_published":"2025-03-01T00:00:00Z","abstract":[{"lang":"eng","text":"High kinetic inductance superconductors are gaining increasing interest for the realisation of qubits, amplifiers and detectors. Moreover, thanks to their high impedance, quantum buses made of such materials enable large zero-point fluctuations of the voltage, boosting the coupling rates to spin and charge qubits. However, fully exploiting the potential of disordered or granular superconductors is challenging, as their inductance and, therefore, impedance at high values are difficult to control. Here, we report a reproducible fabrication of granular aluminium resonators by developing a wireless ohmmeter, which allows in situ measurements during film deposition and, therefore, control of the kinetic inductance of granular aluminium films. Reproducible fabrication of circuits with impedances (inductances) exceeding 13 kΩ (1 nH per square) is now possible. By integrating a 7.9 kΩ resonator with a germanium double quantum dot, we demonstrate strong charge-photon coupling with a rate of gc/2π = 566 ± 2 MHz. This broadly applicable method opens the path for novel qubits and high-fidelity, long-distance two-qubit gates."}],"file":[{"file_name":"2025_NatureComm_Janik.pdf","content_type":"application/pdf","success":1,"checksum":"a9383dd978ca2c50b7dded6c0bb2cd49","date_updated":"2025-03-17T10:53:32Z","file_size":6364878,"creator":"dernst","relation":"main_file","date_created":"2025-03-17T10:53:32Z","access_level":"open_access","file_id":"19415"}],"file_date_updated":"2025-03-17T10:53:32Z","article_processing_charge":"Yes","scopus_import":"1","department":[{"_id":"GeKa"},{"_id":"JoFi"},{"_id":"M-Shop"}],"publication_status":"published","acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"acknowledgement":"We acknowledge Franco De Palma, Mahya Khorramshahi, Fabian Oppliger, Thomas Reisinger, Pasquale Scarlino and Xiao Xue for helpful discussions. We thank Simon Robson for proofreading the manuscript. 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 and the HORIZON-RIA 101069515 project. This research was funded in whole or in part by the Austrian Science Fund (FWF) https://doi.org/10.55776/P32235, https://doi.org/10.55776/I5060 and https://doi.org/10.55776/P36507. For Open Access purposes, the author has applied a CC BY public copyright license to any author accepted manuscript version arising from this submission. M.J. acknowledges funding from FellowQUTE 2024-01. K.R. acknowledges funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 101034413. I.M.P. 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 Quantum Technologies Platform (QTEP). ICN2 is supported by the Severo Ochoa programme 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 programme. 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 acknowledge the use of instrumentation and the technical advice provided by the Joint Electron Microscopy Centre at ALBA (JEMCA). ICN2 acknowledges funding from Grant IU16-014206 (METCAM-FIB) funded by the European Union through the European Regional Development Fund (ERDF), with the support of the Ministry of Research and Universities, Generalitat de Catalunya. ICN2 is a founding member of e-DREAM60.","arxiv":1,"publication_identifier":{"eissn":["2041-1723"]},"author":[{"last_name":"Janik","full_name":"Janik, Marian","id":"396A1950-F248-11E8-B48F-1D18A9856A87","first_name":"Marian"},{"full_name":"Roux, Kevin Etienne Robert","last_name":"Roux","first_name":"Kevin Etienne Robert","id":"53f93ea2-803f-11ed-ab7e-b283135794ef"},{"full_name":"Borja Espinosa, Carla N","last_name":"Borja Espinosa","first_name":"Carla N","id":"18777c01-896a-11ed-bdf8-e4851dc07d16"},{"id":"71616374-A8E9-11E9-A7CA-09ECE5697425","first_name":"Oliver","last_name":"Sagi","full_name":"Sagi, Oliver"},{"last_name":"Baghdadi","full_name":"Baghdadi, Abdulhamid","id":"160D87FA-96B5-11E9-BF77-7626E6697425","first_name":"Abdulhamid"},{"first_name":"Thomas","id":"38756BB2-F248-11E8-B48F-1D18A9856A87","full_name":"Adletzberger, Thomas","last_name":"Adletzberger"},{"full_name":"Calcaterra, Stefano","last_name":"Calcaterra","first_name":"Stefano"},{"last_name":"Botifoll","full_name":"Botifoll, Marc","first_name":"Marc"},{"first_name":"Alba","last_name":"Garzón Manjón","full_name":"Garzón Manjón, Alba"},{"last_name":"Arbiol","full_name":"Arbiol, Jordi","first_name":"Jordi"},{"last_name":"Chrastina","full_name":"Chrastina, Daniel","first_name":"Daniel"},{"full_name":"Isella, Giovanni","last_name":"Isella","first_name":"Giovanni"},{"full_name":"Pop, Ioan M.","last_name":"Pop","first_name":"Ioan M."},{"full_name":"Katsaros, Georgios","orcid":"0000-0001-8342-202X","last_name":"Katsaros","first_name":"Georgios","id":"38DB5788-F248-11E8-B48F-1D18A9856A87"}],"date_updated":"2025-03-17T10:53:50Z","status":"public","OA_type":"gold","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa_version":"Published Version","date_created":"2025-03-16T23:01:23Z","language":[{"iso":"eng"}],"has_accepted_license":"1","intvolume":"        16","month":"03"}