[{"doi":"10.1126/sciadv.ady7222","day":"13","publisher":"American Association for the Advancement of Science","type":"journal_article","citation":{"mla":"Bubis, Anton, et al. “Non-Equilibrium Plasmon Liquid in a Josephson Junction Chain.” <i>Science Advances</i>, vol. 12, no. 7, eady7222, American Association for the Advancement of Science, 2026, doi:<a href=\"https://doi.org/10.1126/sciadv.ady7222\">10.1126/sciadv.ady7222</a>.","ista":"Bubis A, Vigliotti L, Serbyn M, Higginbotham AP. 2026. Non-equilibrium plasmon liquid in a Josephson junction chain. Science Advances. 12(7), eady7222.","apa":"Bubis, A., Vigliotti, L., Serbyn, M., &#38; Higginbotham, A. P. (2026). Non-equilibrium plasmon liquid in a Josephson junction chain. <i>Science Advances</i>. American Association for the Advancement of Science. <a href=\"https://doi.org/10.1126/sciadv.ady7222\">https://doi.org/10.1126/sciadv.ady7222</a>","ieee":"A. Bubis, L. Vigliotti, M. Serbyn, and A. P. Higginbotham, “Non-equilibrium plasmon liquid in a Josephson junction chain,” <i>Science Advances</i>, vol. 12, no. 7. American Association for the Advancement of Science, 2026.","short":"A. Bubis, L. Vigliotti, M. Serbyn, A.P. Higginbotham, Science Advances 12 (2026).","chicago":"Bubis, Anton, Lucia Vigliotti, Maksym Serbyn, and Andrew P Higginbotham. “Non-Equilibrium Plasmon Liquid in a Josephson Junction Chain.” <i>Science Advances</i>. American Association for the Advancement of Science, 2026. <a href=\"https://doi.org/10.1126/sciadv.ady7222\">https://doi.org/10.1126/sciadv.ady7222</a>.","ama":"Bubis A, Vigliotti L, Serbyn M, Higginbotham AP. Non-equilibrium plasmon liquid in a Josephson junction chain. <i>Science Advances</i>. 2026;12(7). doi:<a href=\"https://doi.org/10.1126/sciadv.ady7222\">10.1126/sciadv.ady7222</a>"},"DOAJ_listed":"1","volume":12,"publication":"Science Advances","has_accepted_license":"1","OA_place":"publisher","date_updated":"2026-02-24T07:25:34Z","corr_author":"1","external_id":{"arxiv":["2504.09721"]},"quality_controlled":"1","language":[{"iso":"eng"}],"intvolume":"        12","publication_identifier":{"eissn":["2375-2548"]},"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"acknowledged_ssus":[{"_id":"NanoFab"},{"_id":"M-Shop"}],"file_date_updated":"2026-02-24T07:23:32Z","date_created":"2026-02-22T20:47:38Z","department":[{"_id":"MaSe"},{"_id":"AnHi"},{"_id":"GeKa"}],"PlanS_conform":"1","article_number":"eady7222","title":"Non-equilibrium plasmon liquid in a Josephson junction chain","_id":"21340","issue":"7","year":"2026","oa_version":"Published Version","month":"02","article_processing_charge":"Yes","OA_type":"gold","ddc":["530"],"arxiv":1,"acknowledgement":"We thank V. Vitelli, M. Fruchart, and A. Burshstein for helpful input. We acknowledge technical support from the Nanofabrication Facility and the MIBA machine shop at IST Austria. This research was supported in part by grant NSF PHY-2309135 to the Kavli Institute for Theoretical Physics (KITP), by the Austrian Science Fund (FWF) SFB F86, and by the NOMIS foundation.","date_published":"2026-02-13T00:00:00Z","abstract":[{"lang":"eng","text":"Equilibrium quantum systems are often described by a gas of weakly interacting normal modes. Bringing such systems far from equilibrium, however, can drastically enhance mode-to-mode interactions. Understanding the resulting liquid is a fundamental question for quantum statistical mechanics and a practical question for engineering driven quantum devices. To tackle this question, we probe the non-equilibrium kinetics of one-dimensional plasmons in a long chain of Josephson junctions. We introduce multimode spectroscopy to controllably study the departure from equilibrium, witnessing the evolution from pairwise coupling between plasma modes at weak driving to dramatic, high-order, cascaded couplings at strong driving. Scaling to many-mode drives, we stimulate interactions between hundreds of modes, resulting in near-continuum internal dynamics. Imaging the resulting non-equilibrium plasmon populations, we then resolve the nonlocal redistribution of energy in the response to a weak perturbation—an explicit verification of the emergence of a strongly interacting, non-equilibrium liquid of plasmons."}],"status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","file":[{"date_updated":"2026-02-24T07:23:32Z","file_name":"2026_ScienceAdv_Bubis.pdf","checksum":"8402f322f8f0e858b1d9aac57e306e31","success":1,"file_size":2775975,"relation":"main_file","file_id":"21353","access_level":"open_access","date_created":"2026-02-24T07:23:32Z","creator":"dernst","content_type":"application/pdf"}],"oa":1,"article_type":"original","publication_status":"published","license":"https://creativecommons.org/licenses/by/4.0/","author":[{"id":"1f6212b5-f795-11ec-9c0c-de4780302890","full_name":"Bubis, Anton","first_name":"Anton","last_name":"Bubis"},{"first_name":"Lucia","id":"539e1e1a-e604-11ee-a1df-f02b018e5c8c","full_name":"Vigliotti, Lucia","last_name":"Vigliotti"},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","first_name":"Maksym"},{"first_name":"Andrew P","full_name":"Higginbotham, Andrew P","id":"4AD6785A-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-2607-2363","last_name":"Higginbotham"}]},{"has_accepted_license":"1","OA_place":"publisher","date_updated":"2026-03-23T15:39:34Z","external_id":{"arxiv":["2507.12550"]},"language":[{"iso":"eng"}],"quality_controlled":"1","intvolume":"       136","publication_identifier":{"issn":["0031-9007"],"eissn":["1079-7114"]},"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"date_created":"2026-03-23T14:56:32Z","file_date_updated":"2026-03-23T15:35:27Z","PlanS_conform":"1","department":[{"_id":"MaSe"}],"article_number":"090801","day":"04","doi":"10.1103/rbg2-f61m","publisher":"American Physical Society","type":"journal_article","citation":{"short":"M. Votto, M. Ljubotina, C. Lancien, J.I. Cirac, P. Zoller, M. Serbyn, L. Piroli, B. Vermersch, Physical Review Letters 136 (2026).","mla":"Votto, Matteo, et al. “Learning Mixed Quantum States in Large-Scale Experiments.” <i>Physical Review Letters</i>, vol. 136, no. 9, 090801, American Physical Society, 2026, doi:<a href=\"https://doi.org/10.1103/rbg2-f61m\">10.1103/rbg2-f61m</a>.","ista":"Votto M, Ljubotina M, Lancien C, Cirac JI, Zoller P, Serbyn M, Piroli L, Vermersch B. 2026. Learning mixed quantum states in large-scale experiments. Physical Review Letters. 136(9), 090801.","apa":"Votto, M., Ljubotina, M., Lancien, C., Cirac, J. I., Zoller, P., Serbyn, M., … Vermersch, B. (2026). Learning mixed quantum states in large-scale experiments. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/rbg2-f61m\">https://doi.org/10.1103/rbg2-f61m</a>","ieee":"M. Votto <i>et al.</i>, “Learning mixed quantum states in large-scale experiments,” <i>Physical Review Letters</i>, vol. 136, no. 9. American Physical Society, 2026.","ama":"Votto M, Ljubotina M, Lancien C, et al. Learning mixed quantum states in large-scale experiments. <i>Physical Review Letters</i>. 2026;136(9). doi:<a href=\"https://doi.org/10.1103/rbg2-f61m\">10.1103/rbg2-f61m</a>","chicago":"Votto, Matteo, Marko Ljubotina, Cécilia Lancien, J. Ignacio Cirac, Peter Zoller, Maksym Serbyn, Lorenzo Piroli, and Benoît Vermersch. “Learning Mixed Quantum States in Large-Scale Experiments.” <i>Physical Review Letters</i>. American Physical Society, 2026. <a href=\"https://doi.org/10.1103/rbg2-f61m\">https://doi.org/10.1103/rbg2-f61m</a>."},"volume":136,"publication":"Physical Review Letters","OA_type":"hybrid","ddc":["530"],"arxiv":1,"acknowledgement":"We acknowledge insightful discussions with Antoine Browaeys, Mari Carmen Bañuls, Soonwon Choi, Thierry Lahaye, Daniel Stilck-França, Georgios Styliaris, and Xavier Waintal. The experimental data have been collected using the Qiskit library [103], and have been postprocessed using the RandomMeas [104] and ITensor [105] libraries. The work of M. V. and B. V. was funded by the French National Research Agency via the JCJC project QRand (No. ANR-20-CE47-0005), and via the research programs Plan France 2030 EPIQ (No. ANR-22-\r\nPETQ-0007), QUBITAF (No. ANR-22-PETQ-0004), and HQI (No. ANR-22-PNCQ-0002). We acknowledge the use of IBM Quantum Credits for this work. M. L. acknowledges support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy—EXC-2111–390814868. The work of C. L. was funded by the French National Research Agency via the PRC project ESQuisses (No. ANR-20-CE47-0014-01). J. I. C.\r\nacknowledges funding from the Federal Ministry of Education and Research Germany (BMBF) via the project FermiQP (No. 13N15889). Work at MPQ is part of the Munich Quantum Valley, which is supported by the Bavarian state government with funds from the Hightech Agenda\r\nBayern Plus. P. Z. acknowledges support by the European Union’s Horizon Europe research and innovation program under Grant Agreement No. 101113690 (PASQANS2). The work of L. P. was funded by the European Union (ERC, QUANTHEM, No. 101114881). We acknowledge support\r\nby the Erwin Schrödinger International Institute for Mathematics and Physics (ESI).","date_published":"2026-03-04T00:00:00Z","abstract":[{"lang":"eng","text":"We present and test a protocol to learn the matrix-product operator (MPO) representation of an experimentally prepared quantum state. The protocol takes as input classical shadows corresponding to local randomized measurements, and outputs the tensors of an MPO maximizing a suitably defined fidelity with the experimental state. The tensor optimization is carried out sequentially, similarly to the well-known density matrix renormalization group algorithm. Our approach is provably efficient under certain technical conditions expected to be met in short-range correlated states and in typical noisy experimental settings. Under the same conditions, we also provide an efficient scheme to estimate fidelities between the learned and the experimental states. We experimentally demonstrate our protocol by learning entangled quantum states of up to N = 96 qubits in a superconducting quantum processor. Our method upgrades classical shadows to large-scale quantum computation and simulation experiments."}],"status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","file":[{"checksum":"12b16ce2d49c62b2909da95121bfaadb","success":1,"date_updated":"2026-03-23T15:35:27Z","file_name":"2026_PhysicalReviewLetters_Votto.pdf","access_level":"open_access","date_created":"2026-03-23T15:35:27Z","creator":"dernst","content_type":"application/pdf","relation":"main_file","file_size":500041,"file_id":"21491"}],"oa":1,"article_type":"original","publication_status":"published","author":[{"first_name":"Matteo","full_name":"Votto, Matteo","last_name":"Votto"},{"orcid":"0000-0003-0038-7068","last_name":"Ljubotina","first_name":"Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","full_name":"Ljubotina, Marko"},{"full_name":"Lancien, Cécilia","first_name":"Cécilia","last_name":"Lancien"},{"last_name":"Cirac","full_name":"Cirac, J. Ignacio","first_name":"J. Ignacio"},{"full_name":"Zoller, Peter","first_name":"Peter","last_name":"Zoller"},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","first_name":"Maksym","full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Piroli","first_name":"Lorenzo","full_name":"Piroli, Lorenzo"},{"full_name":"Vermersch, Benoît","first_name":"Benoît","last_name":"Vermersch"}],"title":"Learning mixed quantum states in large-scale experiments","issue":"9","_id":"21480","year":"2026","oa_version":"Published Version","month":"03","article_processing_charge":"Yes (in subscription journal)"},{"publication":"PRX Quantum","ec_funded":1,"type":"journal_article","publisher":"American Physical Society","doi":"10.1103/sl79-1xgb","day":"13","volume":7,"DOAJ_listed":"1","citation":{"ama":"Nicolau Jimenez E, Ljubotina M, Serbyn M. Fragmentation, zero modes, and collective bound states in constrained models. <i>PRX Quantum</i>. 2026;7. doi:<a href=\"https://doi.org/10.1103/sl79-1xgb\">10.1103/sl79-1xgb</a>","chicago":"Nicolau Jimenez, Eulalia, Marko Ljubotina, and Maksym Serbyn. “Fragmentation, Zero Modes, and Collective Bound States in Constrained Models.” <i>PRX Quantum</i>. American Physical Society, 2026. <a href=\"https://doi.org/10.1103/sl79-1xgb\">https://doi.org/10.1103/sl79-1xgb</a>.","short":"E. Nicolau Jimenez, M. Ljubotina, M. Serbyn, PRX Quantum 7 (2026).","ieee":"E. Nicolau Jimenez, M. Ljubotina, and M. Serbyn, “Fragmentation, zero modes, and collective bound states in constrained models,” <i>PRX Quantum</i>, vol. 7. American Physical Society, 2026.","ista":"Nicolau Jimenez E, Ljubotina M, Serbyn M. 2026. Fragmentation, zero modes, and collective bound states in constrained models. PRX Quantum. 7, 010352.","apa":"Nicolau Jimenez, E., Ljubotina, M., &#38; Serbyn, M. (2026). Fragmentation, zero modes, and collective bound states in constrained models. <i>PRX Quantum</i>. American Physical Society. <a href=\"https://doi.org/10.1103/sl79-1xgb\">https://doi.org/10.1103/sl79-1xgb</a>","mla":"Nicolau Jimenez, Eulalia, et al. “Fragmentation, Zero Modes, and Collective Bound States in Constrained Models.” <i>PRX Quantum</i>, vol. 7, 010352, American Physical Society, 2026, doi:<a href=\"https://doi.org/10.1103/sl79-1xgb\">10.1103/sl79-1xgb</a>."},"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"article_number":"010352","department":[{"_id":"MaSe"}],"PlanS_conform":"1","date_created":"2026-03-28T14:57:56Z","file_date_updated":"2026-03-30T06:08:07Z","external_id":{"arxiv":["2504.17627"]},"corr_author":"1","date_updated":"2026-03-30T06:09:28Z","OA_place":"publisher","has_accepted_license":"1","publication_identifier":{"eissn":["2691-3399"]},"intvolume":"         7","language":[{"iso":"eng"}],"quality_controlled":"1","month":"03","article_processing_charge":"Yes","title":"Fragmentation, zero modes, and collective bound states in constrained models","oa_version":"Published Version","year":"2026","_id":"21501","oa":1,"file":[{"access_level":"open_access","date_created":"2026-03-30T06:08:07Z","creator":"dernst","content_type":"application/pdf","relation":"main_file","file_size":1848724,"file_id":"21505","checksum":"d155ffa9e1a8275702149165f4bf963c","success":1,"date_updated":"2026-03-30T06:08:07Z","file_name":"2026_PRXQuantum_Nicolau.pdf"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"last_name":"Nicolau Jimenez","full_name":"Nicolau Jimenez, Eulalia","id":"04b4791c-8fd7-11ee-a7df-be2fdc569c48","first_name":"Eulalia"},{"last_name":"Ljubotina","orcid":"0000-0003-0038-7068","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","first_name":"Marko"},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym"}],"project":[{"grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"article_type":"original","publication_status":"published","acknowledgement":"The authors acknowledge useful discussions with Berislav Buca. This work was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). M.L. acknowledges support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy—EXC-2111—390814868. This research was supported in part by grant NSF PHY-2309135 to the Kavli Institute for Theoretical Physics (KITP).","ddc":["530"],"arxiv":1,"OA_type":"gold","status":"public","scopus_import":"1","abstract":[{"lang":"eng","text":"Kinetically constrained models were originally introduced to capture slow relaxation in glassy systems, where dynamics are hindered by local constraints instead of energy barriers. Their quantum counterparts have recently drawn attention for exhibiting highly degenerate eigenstates at zero energy—known as zero modes—stemming from chiral symmetry. Yet, the structure and implications of these zero modes remain poorly understood. In this work, we focus on the properties of the zero mode subspace in quantum kinetically constrained models with a U(1) particle-conservation symmetry. We use the U(1) East, which lacks inversion symmetry, and the inversion-symmetric U(1) East-West models to illustrate our two main results. First, we observe that the simultaneous presence of constraints and chiral symmetry generally leads to a parametric increase in the number of zero modes due to the fragmentation of the many-body\r\nHilbert space into disconnected sectors. Second, we generalize the concept of compact localized states from single-particle physics and introduce the notion of collective bound states, a special kind of nonergodic eigenstates that are robust to enlarging the system size. We formulate sufficient criteria for their existence, arguing that the degenerate zero mode subspace plays a central role, and demonstrate bound states in both example models and in a two-dimensional model, the U(1) North-East, and in the pairflip model, a system without particle conservation. Our results motivate a systematic study of bound states and their relation to ergodicity breaking, transport, and other properties of quantum kinetically constrained\r\nmodels. "}],"date_published":"2026-03-13T00:00:00Z"},{"scopus_import":"1","date_published":"2025-06-12T00:00:00Z","abstract":[{"lang":"eng","text":"Eigenstates of quantum many-body systems are often used to define phases of matter in and out of equilibrium; however, experimentally accessing highly excited eigenstates is a challenging task, calling for alternative strategies to dynamically probe nonequilibrium phases. In this work, we characterize the dynamical properties of a disordered spin chain, focusing on the spin-glass regime. Using tensor-network simulations, we observe oscillatory behavior of local expectation values and bipartite entanglement entropy. We explain these oscillations deep in the many-body localized spin-glass regime via a simple theoretical model. From perturbation theory, we predict the timescales up to which our analytical description is valid and confirm it with numerical simulations. Finally, we study the correlation length dynamics, which, after a long-time plateau, resume growing in line with renormalization group (RG) expectations. Our work suggests that RG predictions can be quantitatively tested against numerical simulations and experiments, potentially enabling microscopic descriptions of dynamical phases in large systems."}],"status":"public","OA_type":"hybrid","acknowledgement":"We thank D. A. Abanin for insightful discussions in the early stages of this work. P.B. acknowledges support by the Austrian Science Fund (FWF) [Grant Agreement No. 10.55776/ESP9057324]. This research was funded in whole or in part by the Austrian Science Fund (FWF) [10.55776/COE1]. The authors acknowledge support by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Grant Agreement No. 850899). M.L. acknowledges support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy–EXC-2111–390814868. The authors acknowledge PRACE for awarding access to Joliot-Curie at GENCI@CEA, France, where the TEBD simulations were performed. The TEBD simulations were performed using the ITensor library [52].","ddc":["530"],"arxiv":1,"project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"publication_status":"published","article_type":"letter_note","author":[{"first_name":"Pietro","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","full_name":"Brighi, Pietro","orcid":"0000-0002-7969-2729","last_name":"Brighi"},{"last_name":"Ljubotina","orcid":"0000-0003-0038-7068","first_name":"Marko","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E"},{"last_name":"Serbyn","orcid":"0000-0002-2399-5827","first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym"}],"file":[{"success":1,"checksum":"7941f92124793a383ca132eee2c289c5","file_name":"2025_PhysReviewB_Brighi.pdf","date_updated":"2025-06-23T06:28:17Z","content_type":"application/pdf","date_created":"2025-06-23T06:28:17Z","creator":"dernst","access_level":"open_access","file_id":"19861","relation":"main_file","file_size":1082749}],"isi":1,"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","oa":1,"year":"2025","issue":"22","_id":"19833","oa_version":"Published Version","title":"Probing the many-body localized spin-glass phase through quench dynamics","article_processing_charge":"Yes (in subscription journal)","month":"06","intvolume":"       111","quality_controlled":"1","language":[{"iso":"eng"}],"publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"date_updated":"2025-09-30T12:48:10Z","OA_place":"publisher","has_accepted_license":"1","external_id":{"arxiv":["2502.08192"],"isi":["001511503800006"]},"file_date_updated":"2025-06-23T06:28:17Z","date_created":"2025-06-13T06:09:38Z","article_number":"L220202","department":[{"_id":"MaSe"}],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"citation":{"chicago":"Brighi, Pietro, Marko Ljubotina, and Maksym Serbyn. “Probing the Many-Body Localized Spin-Glass Phase through Quench Dynamics.” <i>Physical Review B</i>. American Physical Society, 2025. <a href=\"https://doi.org/10.1103/9fms-ygfz\">https://doi.org/10.1103/9fms-ygfz</a>.","ama":"Brighi P, Ljubotina M, Serbyn M. Probing the many-body localized spin-glass phase through quench dynamics. <i>Physical Review B</i>. 2025;111(22). doi:<a href=\"https://doi.org/10.1103/9fms-ygfz\">10.1103/9fms-ygfz</a>","ieee":"P. Brighi, M. Ljubotina, and M. Serbyn, “Probing the many-body localized spin-glass phase through quench dynamics,” <i>Physical Review B</i>, vol. 111, no. 22. American Physical Society, 2025.","apa":"Brighi, P., Ljubotina, M., &#38; Serbyn, M. (2025). Probing the many-body localized spin-glass phase through quench dynamics. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/9fms-ygfz\">https://doi.org/10.1103/9fms-ygfz</a>","ista":"Brighi P, Ljubotina M, Serbyn M. 2025. Probing the many-body localized spin-glass phase through quench dynamics. Physical Review B. 111(22), L220202.","mla":"Brighi, Pietro, et al. “Probing the Many-Body Localized Spin-Glass Phase through Quench Dynamics.” <i>Physical Review B</i>, vol. 111, no. 22, L220202, American Physical Society, 2025, doi:<a href=\"https://doi.org/10.1103/9fms-ygfz\">10.1103/9fms-ygfz</a>.","short":"P. Brighi, M. Ljubotina, M. Serbyn, Physical Review B 111 (2025)."},"volume":111,"day":"12","doi":"10.1103/9fms-ygfz","publisher":"American Physical Society","type":"journal_article","ec_funded":1,"publication":"Physical Review B"},{"month":"06","article_processing_charge":"Yes (via OA deal)","title":"Superconducting proximity effect in two-dimensional hole gases","year":"2025","_id":"19852","issue":"21","oa_version":"Published Version","file":[{"relation":"main_file","file_size":1719489,"file_id":"19869","access_level":"open_access","date_created":"2025-06-23T10:31:11Z","creator":"dernst","content_type":"application/pdf","date_updated":"2025-06-23T10:31:11Z","file_name":"2025_PhysReviewB_Babkin.pdf","checksum":"fa8757f4780cfaeb51579c626284a8c1","success":1}],"isi":1,"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","oa":1,"project":[{"name":"Center for Correlated Quantum Materials and Solid State Quantum Systems:  Probing topology in circuits and quantum materials","_id":"34a7f947-11ca-11ed-8bc3-c5dc2bbaae25","grant_number":"F8609"}],"article_type":"original","publication_status":"published","author":[{"last_name":"Babkin","first_name":"Serafim","id":"e63d75c3-72ef-11ef-b75a-e303e149911f","full_name":"Babkin, Serafim"},{"last_name":"Joecker","full_name":"Joecker, Benjamin","first_name":"Benjamin"},{"full_name":"Flensberg, Karsten","first_name":"Karsten","last_name":"Flensberg"},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","first_name":"Maksym","full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Danon, Jeroen","first_name":"Jeroen","last_name":"Danon"}],"OA_type":"hybrid","acknowledgement":"We acknowledge useful discussions with Georgios Katsaros, Andrew Higginbotham, and Oliver Schwarze. This research was funded in part by the Austrian Science Fund (FWF) F 86, the European Research Council (Grant Agreement No. 856526), and by the DFG Collaborative Research Center (CRC) 183 Project No. 277101999.","arxiv":1,"ddc":["530"],"scopus_import":"1","abstract":[{"lang":"eng","text":"Technology involving hybrid superconductor–semiconductor materials is a promising avenue for engineering quantum devices for information storage, manipulation, and transmission. Proximity-induced superconducting correlations are an essential part of such devices. While the proximity effect in the conduction band of common semiconductors is well understood, its manifestation in confined hole gases, realized for instance in germanium, is an active area of research. Lower-dimensional hole-based systems, particularly in germanium, are emerging as an attractive platform for a variety of solid-state quantum devices, due to their combination of efficient spin and charge control and long coherence times. The recent experimental realization of the proximity effect in germanium thus calls for a theoretical description that is tailored to hole gases. In this work, we propose a simple model to describe proximity-induced superconductivity in two-dimensional hole gases, incorporating both the heavy-hole (HH) and light-hole (LH) bands. We start from the Luttinger–Kohn model, introduce three parameters that characterize hopping across the superconductor–semiconductor interface, and derive explicit intraband and interband effective pairing terms for the HH and LH bands. Unlike previous approaches, our theory provides a quantitative relationship between induced pairings and interface properties. Restricting our general model to an experimentally relevant case where only the HH band crosses the chemical potential, we predict the coexistence of 𝑠-wave and 𝑑-wave singlet pairings, along with triplet-type pairings, and modified Zeeman and Rashba spin–orbit couplings. Our results thus present a starting point for theoretical modeling of quantum devices based on proximitized hole gases, fueling further progress in quantum technology."}],"date_published":"2025-06-18T00:00:00Z","status":"public","publication":"Physical Review B","day":"18","doi":"10.1103/k4jh-pnxy","publisher":"American Physical Society","type":"journal_article","citation":{"ama":"Babkin S, Joecker B, Flensberg K, Serbyn M, Danon J. Superconducting proximity effect in two-dimensional hole gases. <i>Physical Review B</i>. 2025;111(21). doi:<a href=\"https://doi.org/10.1103/k4jh-pnxy\">10.1103/k4jh-pnxy</a>","chicago":"Babkin, Serafim, Benjamin Joecker, Karsten Flensberg, Maksym Serbyn, and Jeroen Danon. “Superconducting Proximity Effect in Two-Dimensional Hole Gases.” <i>Physical Review B</i>. American Physical Society, 2025. <a href=\"https://doi.org/10.1103/k4jh-pnxy\">https://doi.org/10.1103/k4jh-pnxy</a>.","short":"S. Babkin, B. Joecker, K. Flensberg, M. Serbyn, J. Danon, Physical Review B 111 (2025).","ieee":"S. Babkin, B. Joecker, K. Flensberg, M. Serbyn, and J. Danon, “Superconducting proximity effect in two-dimensional hole gases,” <i>Physical Review B</i>, vol. 111, no. 21. American Physical Society, 2025.","apa":"Babkin, S., Joecker, B., Flensberg, K., Serbyn, M., &#38; Danon, J. (2025). Superconducting proximity effect in two-dimensional hole gases. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/k4jh-pnxy\">https://doi.org/10.1103/k4jh-pnxy</a>","mla":"Babkin, Serafim, et al. “Superconducting Proximity Effect in Two-Dimensional Hole Gases.” <i>Physical Review B</i>, vol. 111, no. 21, 214518, American Physical Society, 2025, doi:<a href=\"https://doi.org/10.1103/k4jh-pnxy\">10.1103/k4jh-pnxy</a>.","ista":"Babkin S, Joecker B, Flensberg K, Serbyn M, Danon J. 2025. Superconducting proximity effect in two-dimensional hole gases. Physical Review B. 111(21), 214518."},"volume":111,"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"file_date_updated":"2025-06-23T10:31:11Z","date_created":"2025-06-19T16:54:54Z","article_number":"214518","department":[{"_id":"MaSe"},{"_id":"GradSch"}],"date_updated":"2025-09-30T12:53:47Z","has_accepted_license":"1","OA_place":"publisher","external_id":{"isi":["001514328000004"],"arxiv":["2412.04084"]},"corr_author":"1","intvolume":"       111","quality_controlled":"1","language":[{"iso":"eng"}],"publication_identifier":{"eissn":["2469-9969"],"issn":["2469-9950"]}},{"publication_status":"published","article_type":"original","project":[{"name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E"}],"author":[{"full_name":"Petrova, Elena","id":"0ac84990-897b-11ed-a09c-f5abb56a4ede","first_name":"Elena","last_name":"Petrova"},{"first_name":"Marko","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","orcid":"0000-0003-0038-7068","last_name":"Ljubotina"},{"first_name":"Gökhan","full_name":"Yalniz, Gökhan","id":"66E74FA2-D8BF-11E9-8249-8DE2E5697425","orcid":"0000-0002-8490-9312","last_name":"Yalniz"},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","first_name":"Maksym"}],"user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","isi":1,"file":[{"file_size":2504713,"relation":"main_file","file_id":"20647","creator":"gyalniz","date_created":"2025-11-14T09:44:10Z","access_level":"open_access","content_type":"application/pdf","file_name":"tldp-kvkd.pdf","date_updated":"2025-11-14T09:44:10Z","checksum":"5d6d04ac518b4118405334e1ddc7a56d","success":1}],"oa":1,"scopus_import":"1","date_published":"2025-11-12T00:00:00Z","abstract":[{"lang":"eng","text":"Describing general quantum many-body dynamics is a challenging task due to the exponential growth of the Hilbert space with system size. The time-dependent variational principle (TDVP) provides a powerful tool to tackle this task by projecting quantum evolution onto a classical dynamical system within a variational manifold. In classical systems, periodic orbits play a crucial role in understanding the structure of the phase space and the long-term behavior of the system. However, finding periodic orbits is generally difficult, and their existence and properties in generic TDVP dynamics over matrix product states have remained largely unexplored. In this work, we develop an algorithm to systematically identify and characterize periodic orbits in TDVP dynamics. Applying our method to the periodically kicked Ising model, we uncover both stable and unstable periodic orbits. We characterize the Kolmogorov-Arnold-Moser tori in the vicinity of stable periodic orbits and track the change of the periodic orbits as we modify the Hamiltonian parameters. We observe that periodic orbits exist at any value of the coupling constant of the kicked Ising model between prethermal and fully thermalizing regimes, but their relevance to quantum dynamics and imprint on quantum eigenstates diminishes as the system leaves the prethermal regime. Our results demonstrate that periodic orbits provide valuable insights into the TDVP approximation of quantum many-body evolution and establish a closer connection between quantum and classical chaos."}],"status":"public","OA_type":"gold","arxiv":1,"ddc":["539"],"acknowledgement":"We acknowledge useful discussions with C. Kollath, A. Green, and D. Huse. E.P., M.L., and M.S. acknowledge support by the European Research Council under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). This research was funded in whole or in part by the Austrian Science Fund (FWF) (Grant No. 10.55776/COE1). 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.L. acknowledges support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy—EXC-2111—390814868. This research was supported in part by National Science Foundation (NSF) Grant No. PHY-2309135 to the Kavli Institute for Theoretical Physics (KITP) and by the Erwin Schrödinger International Institute for Mathematics and Physics (ESI).","article_processing_charge":"Yes","month":"11","_id":"20646","issue":"4","year":"2025","oa_version":"Published Version","title":"Finding periodic orbits in projected quantum many-body dynamics","file_date_updated":"2025-11-14T09:44:10Z","date_created":"2025-11-14T09:40:52Z","department":[{"_id":"GradSch"},{"_id":"BjHo"},{"_id":"MaSe"}],"PlanS_conform":"1","article_number":"040333","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"language":[{"iso":"eng"}],"quality_controlled":"1","intvolume":"         6","publication_identifier":{"eissn":["2691-3399"]},"has_accepted_license":"1","OA_place":"publisher","date_updated":"2026-04-28T13:14:29Z","corr_author":"1","external_id":{"isi":["001616473700003"],"arxiv":["2504.12472"]},"publication":"PRX Quantum","DOAJ_listed":"1","citation":{"ieee":"E. Petrova, M. Ljubotina, G. Yalniz, and M. Serbyn, “Finding periodic orbits in projected quantum many-body dynamics,” <i>PRX Quantum</i>, vol. 6, no. 4. American Physical Society, 2025.","ista":"Petrova E, Ljubotina M, Yalniz G, Serbyn M. 2025. Finding periodic orbits in projected quantum many-body dynamics. PRX Quantum. 6(4), 040333.","mla":"Petrova, Elena, et al. “Finding Periodic Orbits in Projected Quantum Many-Body Dynamics.” <i>PRX Quantum</i>, vol. 6, no. 4, 040333, American Physical Society, 2025, doi:<a href=\"https://doi.org/10.1103/tldp-kvkd\">10.1103/tldp-kvkd</a>.","apa":"Petrova, E., Ljubotina, M., Yalniz, G., &#38; Serbyn, M. (2025). Finding periodic orbits in projected quantum many-body dynamics. <i>PRX Quantum</i>. American Physical Society. <a href=\"https://doi.org/10.1103/tldp-kvkd\">https://doi.org/10.1103/tldp-kvkd</a>","short":"E. Petrova, M. Ljubotina, G. Yalniz, M. Serbyn, PRX Quantum 6 (2025).","chicago":"Petrova, Elena, Marko Ljubotina, Gökhan Yalniz, and Maksym Serbyn. “Finding Periodic Orbits in Projected Quantum Many-Body Dynamics.” <i>PRX Quantum</i>. American Physical Society, 2025. <a href=\"https://doi.org/10.1103/tldp-kvkd\">https://doi.org/10.1103/tldp-kvkd</a>.","ama":"Petrova E, Ljubotina M, Yalniz G, Serbyn M. Finding periodic orbits in projected quantum many-body dynamics. <i>PRX Quantum</i>. 2025;6(4). doi:<a href=\"https://doi.org/10.1103/tldp-kvkd\">10.1103/tldp-kvkd</a>"},"volume":6,"doi":"10.1103/tldp-kvkd","publisher":"American Physical Society","day":"12","ec_funded":1,"type":"journal_article","related_material":{"link":[{"url":"https://ista.ac.at/en/news/reaching-for-the-quantum-scars/","relation":"press_release","description":"News on ISTA website"}]}},{"article_processing_charge":"Yes (via OA deal)","month":"04","pmid":1,"oa_version":"Published Version","year":"2025","issue":"16","_id":"19664","title":"Quantum many-body scars beyond the PXP model in Rydberg simulators","author":[{"id":"ade85a9c-3200-11ee-973b-91c1eb240410","full_name":"Kerschbaumer, Aron","first_name":"Aron","last_name":"Kerschbaumer","orcid":"0009-0002-2370-8661"},{"full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","first_name":"Marko","last_name":"Ljubotina","orcid":"0000-0003-0038-7068"},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","first_name":"Maksym"},{"first_name":"Jean-Yves Marc","id":"6c292945-a610-11ed-9eec-c3be1ad62a80","full_name":"Desaules, Jean-Yves Marc","last_name":"Desaules","orcid":"0000-0002-3749-6375"}],"project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020"},{"_id":"fc2ed2f7-9c52-11eb-aca3-c01059dda49c","grant_number":"101034413","call_identifier":"H2020","name":"IST-BRIDGE: International postdoctoral program"}],"article_type":"original","publication_status":"published","oa":1,"file":[{"content_type":"application/pdf","creator":"dernst","date_created":"2025-05-12T07:33:38Z","access_level":"open_access","file_id":"19677","file_size":1028993,"relation":"main_file","success":1,"checksum":"b7f581291e20f152d0efc64727314ca2","file_name":"2025_PhysReviewLetters_Kerschbaumer.pdf","date_updated":"2025-05-12T07:33:38Z"}],"user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","isi":1,"status":"public","abstract":[{"text":"Persistent revivals recently observed in Rydberg atom simulators have challenged our understanding of thermalization and attracted much interest to the concept of quantum many-body scars (QMBSs). QMBSs are non-thermal highly excited eigenstates that coexist with typical eigenstates in the spectrum of many-body Hamiltonians, and have since been reported in multiple theoretical models, including the so-called PXP model, approximately realized by Rydberg simulators. At the same time, questions of how common QMBSs are and in what models they are physically realized remain open. In this Letter, we demonstrate that QMBSs exist in a broader family of models that includes and generalizes PXP to longer-range constraints and states with different periodicity. We show that in each model, multiple QMBS families can be found. Each of them relies on a different approximate algebra, leading to oscillatory dynamics in all cases. However, in contrast to the PXP model, their observation requires launching dynamics from weakly entangled initial states rather than from a product state. QMBSs reported here may be experimentally probed using Rydberg atom simulator in the regime of longer-range Rydberg blockades.","lang":"eng"}],"date_published":"2025-04-22T00:00:00Z","scopus_import":"1","acknowledgement":"The authors are grateful to Zlatko Papić, Dolev Bluvstein, Nishad Maskara, Marcello Dalmonte, Thomas Iadecola, and Johannes Feldmeier for insightful discussions. A. K., M. L., and M. S. acknowledge support by the European Research Council under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). J.-Y. D. acknowledges funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 101034413.","ddc":["530"],"arxiv":1,"OA_type":"hybrid","publication":"Physical Review Letters","volume":134,"citation":{"chicago":"Kerschbaumer, Aron, Marko Ljubotina, Maksym Serbyn, and Jean-Yves Marc Desaules. “Quantum Many-Body Scars beyond the PXP Model in Rydberg Simulators.” <i>Physical Review Letters</i>. American Physical Society, 2025. <a href=\"https://doi.org/10.1103/PhysRevLett.134.160401\">https://doi.org/10.1103/PhysRevLett.134.160401</a>.","ama":"Kerschbaumer A, Ljubotina M, Serbyn M, Desaules J-YM. Quantum many-body scars beyond the PXP model in Rydberg simulators. <i>Physical Review Letters</i>. 2025;134(16). doi:<a href=\"https://doi.org/10.1103/PhysRevLett.134.160401\">10.1103/PhysRevLett.134.160401</a>","ieee":"A. Kerschbaumer, M. Ljubotina, M. Serbyn, and J.-Y. M. Desaules, “Quantum many-body scars beyond the PXP model in Rydberg simulators,” <i>Physical Review Letters</i>, vol. 134, no. 16. American Physical Society, 2025.","apa":"Kerschbaumer, A., Ljubotina, M., Serbyn, M., &#38; Desaules, J.-Y. M. (2025). Quantum many-body scars beyond the PXP model in Rydberg simulators. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevLett.134.160401\">https://doi.org/10.1103/PhysRevLett.134.160401</a>","mla":"Kerschbaumer, Aron, et al. “Quantum Many-Body Scars beyond the PXP Model in Rydberg Simulators.” <i>Physical Review Letters</i>, vol. 134, no. 16, 160401, American Physical Society, 2025, doi:<a href=\"https://doi.org/10.1103/PhysRevLett.134.160401\">10.1103/PhysRevLett.134.160401</a>.","ista":"Kerschbaumer A, Ljubotina M, Serbyn M, Desaules J-YM. 2025. Quantum many-body scars beyond the PXP model in Rydberg simulators. Physical Review Letters. 134(16), 160401.","short":"A. Kerschbaumer, M. Ljubotina, M. Serbyn, J.-Y.M. Desaules, Physical Review Letters 134 (2025)."},"related_material":{"link":[{"relation":"press_release","description":"News on ISTA website","url":"https://ista.ac.at/en/news/a-sky-full-of-quantum-scars/"}],"record":[{"status":"public","id":"19623","relation":"research_data"}]},"type":"journal_article","ec_funded":1,"doi":"10.1103/PhysRevLett.134.160401","publisher":"American Physical Society","day":"22","article_number":"160401","department":[{"_id":"MaSe"}],"date_created":"2025-05-11T22:02:38Z","file_date_updated":"2025-05-12T07:33:38Z","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"publication_identifier":{"issn":["0031-9007"],"eissn":["1079-7114"]},"intvolume":"       134","quality_controlled":"1","language":[{"iso":"eng"}],"external_id":{"arxiv":["2410.18913"],"pmid":["40344113"],"isi":["001480669300011"]},"date_updated":"2026-04-28T13:34:57Z","OA_place":"publisher","has_accepted_license":"1"},{"doi":"10.1103/prxquantum.5.040311","publisher":"American Physical Society","day":"23","ec_funded":1,"type":"journal_article","citation":{"ama":"Ljubotina M, Petrova E, Schuch N, Serbyn M. Tangent space generators of matrix product states and exact floquet quantum scars. <i>PRX Quantum</i>. 2024;5(4). doi:<a href=\"https://doi.org/10.1103/prxquantum.5.040311\">10.1103/prxquantum.5.040311</a>","chicago":"Ljubotina, Marko, Elena Petrova, Norbert Schuch, and Maksym Serbyn. “Tangent Space Generators of Matrix Product States and Exact Floquet Quantum Scars.” <i>PRX Quantum</i>. American Physical Society, 2024. <a href=\"https://doi.org/10.1103/prxquantum.5.040311\">https://doi.org/10.1103/prxquantum.5.040311</a>.","short":"M. Ljubotina, E. Petrova, N. Schuch, M. Serbyn, PRX Quantum 5 (2024).","ieee":"M. Ljubotina, E. Petrova, N. Schuch, and M. Serbyn, “Tangent space generators of matrix product states and exact floquet quantum scars,” <i>PRX Quantum</i>, vol. 5, no. 4. American Physical Society, 2024.","apa":"Ljubotina, M., Petrova, E., Schuch, N., &#38; Serbyn, M. (2024). Tangent space generators of matrix product states and exact floquet quantum scars. <i>PRX Quantum</i>. American Physical Society. <a href=\"https://doi.org/10.1103/prxquantum.5.040311\">https://doi.org/10.1103/prxquantum.5.040311</a>","mla":"Ljubotina, Marko, et al. “Tangent Space Generators of Matrix Product States and Exact Floquet Quantum Scars.” <i>PRX Quantum</i>, vol. 5, no. 4, 040311, American Physical Society, 2024, doi:<a href=\"https://doi.org/10.1103/prxquantum.5.040311\">10.1103/prxquantum.5.040311</a>.","ista":"Ljubotina M, Petrova E, Schuch N, Serbyn M. 2024. Tangent space generators of matrix product states and exact floquet quantum scars. PRX Quantum. 5(4), 040311."},"DOAJ_listed":"1","volume":5,"publication":"PRX Quantum","date_updated":"2025-09-08T14:26:29Z","OA_place":"publisher","has_accepted_license":"1","external_id":{"arxiv":["2403.12325"],"isi":["001346198800001"]},"corr_author":"1","intvolume":"         5","quality_controlled":"1","language":[{"iso":"eng"}],"publication_identifier":{"eissn":["2691-3399"]},"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"date_created":"2024-10-29T16:04:05Z","file_date_updated":"2024-10-30T08:59:09Z","article_number":"040311","department":[{"_id":"MaSe"}],"title":"Tangent space generators of matrix product states and exact floquet quantum scars","APC_amount":"3711,01 EUR","year":"2024","issue":"4","_id":"18488","oa_version":"Published Version","month":"10","article_processing_charge":"Yes","OA_type":"gold","acknowledgement":"We thank L. Piroli, S. Garratt, and A. Molnár for insightful discussions. This research was funded in part by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreements No. 850899 and No. 863476), the Austrian Science Fund (FWF) (Grant DOIs 10.55776/COE1, 10.55776/P36305, and 10.55776/F71), and the European Union (NextGenerationEU). This work was performed in part at the Aspen Center for Physics, which is supported by National Science Foundation Grant PHY-2210452. This research was supported in part by NSF Grant PHY-2309135 to the Kavli Institute for Theoretical Physics (KITP).","arxiv":1,"ddc":["530"],"abstract":[{"lang":"eng","text":"The advancement of quantum simulators motivates the development of a theoretical framework to assist with efficient state preparation in quantum many-body systems. Generally, preparing a target entangled state via unitary evolution with time-dependent couplings is a challenging task and very little is known about the existence of solutions and their properties. In this work we develop a constructive approach for preparing matrix product states (MPS) via continuous unitary evolution. We provide an explicit construction of the operator that exactly implements the evolution of a given MPS along a specified direction in its tangent space. This operator can be written as a sum of local terms of finite range, yet it is in general non-Hermitian. Relying on the explicit construction of the non-Hermitian generator of the dynamics, we demonstrate the existence of a Hermitian sequence of operators that implements the desired MPS evolution with an error that decreases exponentially with the operator range. The construction is benchmarked on an explicit periodic trajectory in a translationally invariant MPS manifold. We demonstrate that the Floquet unitary generating the dynamics over one period of the trajectory features an approximate MPS-like eigenstate embedded among a sea of thermalizing eigenstates. These results show that our construction is not only useful for state preparation and control of many-body systems, but also provides a generic route towards Floquet scars—periodically driven models with quasilocal generators of dynamics that have exact MPS eigenstates in their spectrum."}],"date_published":"2024-10-23T00:00:00Z","scopus_import":"1","status":"public","file":[{"success":1,"checksum":"2e057ba021744d0a74602517935326b3","file_name":"2024_PRXQuantum_Ljubotina.pdf","date_updated":"2024-10-30T08:59:09Z","content_type":"application/pdf","date_created":"2024-10-30T08:59:09Z","creator":"dernst","access_level":"open_access","file_id":"18489","relation":"main_file","file_size":1151431}],"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","isi":1,"oa":1,"project":[{"call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899"}],"article_type":"original","publication_status":"published","author":[{"id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","full_name":"Ljubotina, Marko","first_name":"Marko","last_name":"Ljubotina","orcid":"0000-0003-0038-7068"},{"last_name":"Petrova","first_name":"Elena","full_name":"Petrova, Elena","id":"0ac84990-897b-11ed-a09c-f5abb56a4ede"},{"last_name":"Schuch","full_name":"Schuch, Norbert","first_name":"Norbert"},{"first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","last_name":"Serbyn","orcid":"0000-0002-2399-5827"}]},{"publication_identifier":{"issn":["0028-0836"],"eissn":["1476-4687"]},"language":[{"iso":"eng"}],"quality_controlled":"1","intvolume":"       635","external_id":{"pmid":["39604614"],"isi":["001367935000029"]},"date_updated":"2025-09-08T14:57:35Z","department":[{"_id":"MaSe"}],"date_created":"2024-12-03T18:08:16Z","volume":635,"citation":{"short":"D. Abanin, M. Serbyn, Nature 635 (2024) 825–826.","ieee":"D. Abanin and M. Serbyn, “Quantum scars make their mark in graphene,” <i>Nature</i>, vol. 635, no. 8040. Springer Nature, pp. 825–826, 2024.","ista":"Abanin D, Serbyn M. 2024. Quantum scars make their mark in graphene. Nature. 635(8040), 825–826.","mla":"Abanin, Dmitry, and Maksym Serbyn. “Quantum Scars Make Their Mark in Graphene.” <i>Nature</i>, vol. 635, no. 8040, Springer Nature, 2024, pp. 825–26, doi:<a href=\"https://doi.org/10.1038/d41586-024-03649-y\">10.1038/d41586-024-03649-y</a>.","apa":"Abanin, D., &#38; Serbyn, M. (2024). Quantum scars make their mark in graphene. <i>Nature</i>. Springer Nature. <a href=\"https://doi.org/10.1038/d41586-024-03649-y\">https://doi.org/10.1038/d41586-024-03649-y</a>","ama":"Abanin D, Serbyn M. Quantum scars make their mark in graphene. <i>Nature</i>. 2024;635(8040):825-826. doi:<a href=\"https://doi.org/10.1038/d41586-024-03649-y\">10.1038/d41586-024-03649-y</a>","chicago":"Abanin, Dmitry, and Maksym Serbyn. “Quantum Scars Make Their Mark in Graphene.” <i>Nature</i>. Springer Nature, 2024. <a href=\"https://doi.org/10.1038/d41586-024-03649-y\">https://doi.org/10.1038/d41586-024-03649-y</a>."},"type":"journal_article","day":"27","doi":"10.1038/d41586-024-03649-y","publisher":"Springer Nature","page":"825-826","publication":"Nature","status":"public","date_published":"2024-11-27T00:00:00Z","abstract":[{"lang":"eng","text":"By patterning an ultrathin layered structure with tiny wells, physicists have created and imaged peculiar states known as quantum scars — revealing behaviour that could be used to boost the performance of electronic devices."}],"scopus_import":"1","OA_type":"closed access","author":[{"last_name":"Abanin","full_name":"Abanin, Dmitry","first_name":"Dmitry"},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","first_name":"Maksym"}],"publication_status":"published","article_type":"letter_note","isi":1,"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","oa_version":"None","issue":"8040","_id":"18616","year":"2024","title":"Quantum scars make their mark in graphene","article_processing_charge":"No","month":"11","pmid":1},{"publication_status":"published","article_type":"original","project":[{"name":"Protected states of quantum matter","_id":"eb9b30ac-77a9-11ec-83b8-871f581d53d2"},{"name":"Center for Correlated Quantum Materials and Solid State Quantum Systems:  Probing topology in circuits and quantum materials","grant_number":"F8609","_id":"34a7f947-11ca-11ed-8bc3-c5dc2bbaae25"}],"author":[{"last_name":"Babkin","orcid":"0009-0003-7382-8036","full_name":"Babkin, Serafim","id":"41e64307-6672-11ee-b9ad-cc7a0075a479","first_name":"Serafim"},{"full_name":"Higginbotham, Andrew P","id":"4AD6785A-F248-11E8-B48F-1D18A9856A87","first_name":"Andrew P","orcid":"0000-0003-2607-2363","last_name":"Higginbotham"},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","first_name":"Maksym"}],"isi":1,"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","file":[{"content_type":"application/pdf","date_created":"2024-05-07T12:58:47Z","creator":"dernst","access_level":"open_access","file_id":"15369","file_size":2733685,"relation":"main_file","success":1,"checksum":"f999204856417dcf5a736ac8df432b96","file_name":"2024_SciPostPhys_Babkin.pdf","date_updated":"2024-05-07T12:58:47Z"}],"oa":1,"abstract":[{"lang":"eng","text":"Two-dimensional semiconductor-superconductor heterostructures form the foundation of numerous nanoscale physical systems. However, measuring the properties of such heterostructures, and characterizing the semiconductor in-situ is challenging. A recent experimental study by [Phys. Rev. Lett. 128, 107701 (2022)] was able to probe the semiconductor within the heterostructure using microwave measurements of the superfluid density. This work revealed a rapid depletion of superfluid density in semiconductor, caused by the in-plane magnetic field which in presence of spin-orbit coupling creates so-called Bogoliubov Fermi surfaces. The experimental work used a simplified theoretical model that neglected the presence of non-magnetic disorder in the semiconductor, hence describing the data only qualitatively. Motivated by experiments, we introduce a theoretical model describing a disordered semiconductor with strong spin-orbit coupling that is proximitized by a superconductor. Our model provides specific predictions for the density of states and superfluid density. Presence of disorder leads to the emergence of a gapless superconducting phase, that may be viewed as a manifestation of Bogoliubov Fermi surface. When applied to real experimental data, our model showcases excellent quantitative agreement, enabling the extraction of material parameters such as mean free path and mobility, and estimating g-tensor after taking into account the orbital contribution of magnetic field. Our model can be used to probe in-situ parameters of other superconductor-semiconductor heterostructures and can be further extended to give access to transport properties."}],"date_published":"2024-05-01T00:00:00Z","scopus_import":"1","status":"public","arxiv":1,"ddc":["530"],"acknowledgement":"We acknowledge useful discussions with M. Geier, A. Levchenko, B. Ramshaw, T. Scaffidi, and\r\nJ. Shabani. This research was funded by the Austrian Science Fund (FWF) F 86.\r\nFor the purpose of open access, authors have applied a CC BY public copyright licence to any\r\nAuthor Accepted Manuscript version arising from this submission. MS acknowledges hospitality of KITP supported in part by the National Science Foundation under Grants No. NSF\r\nPHY-1748958 and PHY-2309135. APH acknowledges the support of the NOMIS foundation.","article_processing_charge":"Yes","month":"05","issue":"5","_id":"15367","year":"2024","oa_version":"Published Version","title":"Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor in magnetic field","file_date_updated":"2024-05-07T12:58:47Z","date_created":"2024-05-06T09:02:18Z","department":[{"_id":"MaSe"},{"_id":"AnHi"}],"article_number":"115","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"quality_controlled":"1","language":[{"iso":"eng"}],"intvolume":"        16","publication_identifier":{"issn":["2542-4653"]},"has_accepted_license":"1","date_updated":"2025-09-04T13:53:20Z","corr_author":"1","external_id":{"arxiv":["2311.09347"],"isi":["001215855200002"]},"publication":"SciPost Physics","citation":{"short":"S. Babkin, A.P. Higginbotham, M. Serbyn, SciPost Physics 16 (2024).","mla":"Babkin, Serafim, et al. “Proximity-Induced Gapless Superconductivity in Two-Dimensional Rashba Semiconductor in Magnetic Field.” <i>SciPost Physics</i>, vol. 16, no. 5, 115, SciPost Foundation, 2024, doi:<a href=\"https://doi.org/10.21468/scipostphys.16.5.115\">10.21468/scipostphys.16.5.115</a>.","ista":"Babkin S, Higginbotham AP, Serbyn M. 2024. Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor in magnetic field. SciPost Physics. 16(5), 115.","apa":"Babkin, S., Higginbotham, A. P., &#38; Serbyn, M. (2024). Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor in magnetic field. <i>SciPost Physics</i>. SciPost Foundation. <a href=\"https://doi.org/10.21468/scipostphys.16.5.115\">https://doi.org/10.21468/scipostphys.16.5.115</a>","ieee":"S. Babkin, A. P. Higginbotham, and M. Serbyn, “Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor in magnetic field,” <i>SciPost Physics</i>, vol. 16, no. 5. SciPost Foundation, 2024.","ama":"Babkin S, Higginbotham AP, Serbyn M. Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor in magnetic field. <i>SciPost Physics</i>. 2024;16(5). doi:<a href=\"https://doi.org/10.21468/scipostphys.16.5.115\">10.21468/scipostphys.16.5.115</a>","chicago":"Babkin, Serafim, Andrew P Higginbotham, and Maksym Serbyn. “Proximity-Induced Gapless Superconductivity in Two-Dimensional Rashba Semiconductor in Magnetic Field.” <i>SciPost Physics</i>. SciPost Foundation, 2024. <a href=\"https://doi.org/10.21468/scipostphys.16.5.115\">https://doi.org/10.21468/scipostphys.16.5.115</a>."},"volume":16,"publisher":"SciPost Foundation","day":"01","doi":"10.21468/scipostphys.16.5.115","type":"journal_article"},{"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"department":[{"_id":"MaSe"}],"article_number":"031035","date_created":"2024-09-04T18:57:11Z","file_date_updated":"2024-09-05T09:39:00Z","external_id":{"arxiv":["2311.08108"],"isi":["001299667100002"]},"OA_place":"publisher","has_accepted_license":"1","date_updated":"2025-09-08T09:04:14Z","publication_identifier":{"issn":["2160-3308"]},"quality_controlled":"1","language":[{"iso":"eng"}],"intvolume":"        14","publication":"Physical Review X","type":"journal_article","ec_funded":1,"doi":"10.1103/physrevx.14.031035","day":"26","publisher":"American Physical Society","volume":14,"DOAJ_listed":"1","citation":{"ama":"Vermersch B, Ljubotina M, Cirac JI, Zoller P, Serbyn M, Piroli L. Many-body entropies and entanglement from polynomially many local measurements. <i>Physical Review X</i>. 2024;14(3). doi:<a href=\"https://doi.org/10.1103/physrevx.14.031035\">10.1103/physrevx.14.031035</a>","chicago":"Vermersch, Benoît, Marko Ljubotina, J. Ignacio Cirac, Peter Zoller, Maksym Serbyn, and Lorenzo Piroli. “Many-Body Entropies and Entanglement from Polynomially Many Local Measurements.” <i>Physical Review X</i>. American Physical Society, 2024. <a href=\"https://doi.org/10.1103/physrevx.14.031035\">https://doi.org/10.1103/physrevx.14.031035</a>.","short":"B. Vermersch, M. Ljubotina, J.I. Cirac, P. Zoller, M. Serbyn, L. Piroli, Physical Review X 14 (2024).","apa":"Vermersch, B., Ljubotina, M., Cirac, J. I., Zoller, P., Serbyn, M., &#38; Piroli, L. (2024). Many-body entropies and entanglement from polynomially many local measurements. <i>Physical Review X</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevx.14.031035\">https://doi.org/10.1103/physrevx.14.031035</a>","mla":"Vermersch, Benoît, et al. “Many-Body Entropies and Entanglement from Polynomially Many Local Measurements.” <i>Physical Review X</i>, vol. 14, no. 3, 031035, American Physical Society, 2024, doi:<a href=\"https://doi.org/10.1103/physrevx.14.031035\">10.1103/physrevx.14.031035</a>.","ista":"Vermersch B, Ljubotina M, Cirac JI, Zoller P, Serbyn M, Piroli L. 2024. Many-body entropies and entanglement from polynomially many local measurements. Physical Review X. 14(3), 031035.","ieee":"B. Vermersch, M. Ljubotina, J. I. Cirac, P. Zoller, M. Serbyn, and L. Piroli, “Many-body entropies and entanglement from polynomially many local measurements,” <i>Physical Review X</i>, vol. 14, no. 3. American Physical Society, 2024."},"oa":1,"isi":1,"user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","file":[{"date_created":"2024-09-05T09:39:00Z","creator":"cchlebak","access_level":"open_access","content_type":"application/pdf","file_size":1408836,"relation":"main_file","file_id":"17532","checksum":"1b114acc89025120727200681e4e9074","success":1,"file_name":"2024_PhysRevX_Vermersch.pdf","date_updated":"2024-09-05T09:39:00Z"}],"author":[{"last_name":"Vermersch","first_name":"Benoît","full_name":"Vermersch, Benoît"},{"last_name":"Ljubotina","orcid":"0000-0003-0038-7068","first_name":"Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","full_name":"Ljubotina, Marko"},{"full_name":"Cirac, J. Ignacio","first_name":"J. Ignacio","last_name":"Cirac"},{"last_name":"Zoller","first_name":"Peter","full_name":"Zoller, Peter"},{"full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym","last_name":"Serbyn","orcid":"0000-0002-2399-5827"},{"full_name":"Piroli, Lorenzo","first_name":"Lorenzo","last_name":"Piroli"}],"article_type":"original","publication_status":"published","project":[{"call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E"}],"arxiv":1,"ddc":["530"],"acknowledgement":"B. V. acknowledges funding from the Austrian Science Foundation (Grant No. FWF, P 32597 N), from the French National Research Agency via the JCJC project QRand (Grant No. ANR-20-CE47-0005), and via the research programs Plan France 2030 EPIQ (Grant No. ANR-22-PETQ-0007), QUBITAF (Grant No. ANR-22-PETQ-0004), and HQI (Grant No. ANR-22-PNCQ-0002). M. L. and M. S. acknowledge support by the European Research Council under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). M. S. acknowledges the hospitality of KITP supported in part by the National Science Foundation under Grants No. NSF PHY-1748958 and No. NSF PHY-2309135. J. I. C. is supported by the Hightech Agenda Bayern Plus through the Munich Quantum Valley and the German Federal Ministry of Education and Research through EQUAHUMO (Grant No. 13N16066). P. Z. acknowledges funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 101113690 (PASQuanS2.1).","OA_type":"gold","status":"public","scopus_import":"1","abstract":[{"lang":"eng","text":"Estimating global properties of many-body quantum systems such as entropy or bipartite entanglement is a notoriously difficult task, typically requiring a number of measurements or classical postprocessing resources growing exponentially in the system size. In this work, we address the problem of estimating global entropies and mixed-state entanglement via partial-transposed (PT) moments and show that efficient estimation strategies exist under the assumption that all the spatial correlation lengths are finite. Focusing on one-dimensional systems, we identify a set of approximate factorization conditions (AFCs) on the system density matrix, which allow us to reconstruct entropies and PT moments from information on local subsystems. This identification yields a simple and efficient strategy for entropy and entanglement estimation. Our method could be implemented in different ways, depending on how information on local subsystems is extracted. Focusing on randomized measurements providing a practical and common measurement scheme, we prove that our protocol requires only polynomially many measurements and postprocessing operations, assuming that the state to be measured satisfies the AFCs. We prove that the AFCs hold for finite-depth quantum-circuit states and translation-invariant matrix-product density operators and provide numerical evidence that they are satisfied in more general, physically interesting cases, including thermal states of local Hamiltonians. We argue that our method could be practically useful to detect bipartite mixed-state entanglement for large numbers of qubits available in today’s quantum platforms."}],"date_published":"2024-08-26T00:00:00Z","month":"08","article_processing_charge":"Yes","APC_amount":"4863,6 EUR","title":"Many-body entropies and entanglement from polynomially many local measurements","oa_version":"Published Version","_id":"17493","issue":"3","year":"2024"},{"oa":1,"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_number":"2405.10125","author":[{"first_name":"Raimel A","full_name":"Medina Ramos, Raimel A","id":"CE680B90-D85A-11E9-B684-C920E6697425","orcid":"0000-0002-5383-2869","last_name":"Medina Ramos"},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym"}],"department":[{"_id":"MaSe"}],"date_created":"2024-07-10T13:12:09Z","publication_status":"draft","external_id":{"arxiv":["2405.10125"]},"arxiv":1,"corr_author":"1","date_updated":"2026-04-07T12:43:22Z","OA_place":"repository","status":"public","language":[{"iso":"eng"}],"date_published":"2024-05-16T00:00:00Z","abstract":[{"text":"The quantum approximate optimization algorithm (QAOA) uses a quantum computer\r\nto implement a variational method with $2p$ layers of alternating unitary\r\noperators, optimized by a classical computer to minimize a cost function. While\r\nrigorous performance guarantees exist for the QAOA at small depths $p$, the\r\nbehavior at large depths remains less clear, though simulations suggest\r\nexponentially fast convergence for certain problems. In this work, we gain\r\ninsights into the deep QAOA using an analytic expansion of the cost function\r\naround transition states. Transition states are constructed in a recursive\r\nmanner: from the local minima of the QAOA with $p$ layers we obtain transition\r\nstates of the QAOA with $p+1$ layers, which are stationary points characterized\r\nby a unique direction of negative curvature. We construct an analytic estimate\r\nof the negative curvature and the corresponding direction in parameter space at\r\neach transition state. The expansion of the QAOA cost function along the\r\nnegative direction to the quartic order gives a lower bound of the QAOA cost\r\nfunction improvement. We provide physical intuition behind the analytic\r\nexpressions for the local curvature and quartic expansion coefficient. Our\r\nnumerical study confirms the accuracy of our approximations and reveals that\r\nthe obtained bound and the true value of the QAOA cost function gain have a\r\ncharacteristic exponential decrease with the number of layers $p$, with the\r\nbound decreasing more rapidly. Our study establishes an analytical method for\r\nrecursively studying the QAOA that is applicable in the regime of high circuit\r\ndepth.","lang":"eng"}],"month":"05","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2405.10125"}],"article_processing_charge":"No","publication":"arXiv","related_material":{"record":[{"id":"17208","relation":"dissertation_contains","status":"public"}]},"title":"A recursive lower bound on the energy improvement of the quantum approximate optimization algorithm","type":"preprint","doi":"10.48550/arXiv.2405.10125","day":"16","oa_version":"Preprint","year":"2024","_id":"17222","citation":{"short":"R.A. Medina Ramos, M. Serbyn, ArXiv (n.d.).","ieee":"R. A. Medina Ramos and M. Serbyn, “A recursive lower bound on the energy improvement of the quantum approximate optimization algorithm,” <i>arXiv</i>. .","mla":"Medina Ramos, Raimel A., and Maksym Serbyn. “A Recursive Lower Bound on the Energy Improvement of the Quantum Approximate Optimization Algorithm.” <i>ArXiv</i>, 2405.10125, doi:<a href=\"https://doi.org/10.48550/arXiv.2405.10125\">10.48550/arXiv.2405.10125</a>.","ista":"Medina Ramos RA, Serbyn M. A recursive lower bound on the energy improvement of the quantum approximate optimization algorithm. arXiv, 2405.10125.","apa":"Medina Ramos, R. A., &#38; Serbyn, M. (n.d.). A recursive lower bound on the energy improvement of the quantum approximate optimization algorithm. <i>arXiv</i>. <a href=\"https://doi.org/10.48550/arXiv.2405.10125\">https://doi.org/10.48550/arXiv.2405.10125</a>","ama":"Medina Ramos RA, Serbyn M. A recursive lower bound on the energy improvement of the quantum approximate optimization algorithm. <i>arXiv</i>. doi:<a href=\"https://doi.org/10.48550/arXiv.2405.10125\">10.48550/arXiv.2405.10125</a>","chicago":"Medina Ramos, Raimel A, and Maksym Serbyn. “A Recursive Lower Bound on the Energy Improvement of the Quantum Approximate Optimization Algorithm.” <i>ArXiv</i>, n.d. <a href=\"https://doi.org/10.48550/arXiv.2405.10125\">https://doi.org/10.48550/arXiv.2405.10125</a>."}},{"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"article_number":"054201","department":[{"_id":"MaSe"}],"file_date_updated":"2023-08-07T09:48:08Z","date_created":"2023-08-05T18:25:22Z","external_id":{"arxiv":["2303.16876"]},"corr_author":"1","date_updated":"2025-04-14T07:52:06Z","has_accepted_license":"1","publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"intvolume":"       108","quality_controlled":"1","language":[{"iso":"eng"}],"publication":"Physical Review B","type":"journal_article","ec_funded":1,"doi":"10.1103/physrevb.108.054201","day":"01","publisher":"American Physical Society","volume":108,"citation":{"chicago":"Brighi, Pietro, Marko Ljubotina, Dmitry A. Abanin, and Maksym Serbyn. “Many-Body Localization Proximity Effect in a Two-Species Bosonic Hubbard Model.” <i>Physical Review B</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/physrevb.108.054201\">https://doi.org/10.1103/physrevb.108.054201</a>.","ama":"Brighi P, Ljubotina M, Abanin DA, Serbyn M. Many-body localization proximity effect in a two-species bosonic Hubbard model. <i>Physical Review B</i>. 2023;108(5). doi:<a href=\"https://doi.org/10.1103/physrevb.108.054201\">10.1103/physrevb.108.054201</a>","ieee":"P. Brighi, M. Ljubotina, D. A. Abanin, and M. Serbyn, “Many-body localization proximity effect in a two-species bosonic Hubbard model,” <i>Physical Review B</i>, vol. 108, no. 5. American Physical Society, 2023.","apa":"Brighi, P., Ljubotina, M., Abanin, D. A., &#38; Serbyn, M. (2023). Many-body localization proximity effect in a two-species bosonic Hubbard model. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.108.054201\">https://doi.org/10.1103/physrevb.108.054201</a>","mla":"Brighi, Pietro, et al. “Many-Body Localization Proximity Effect in a Two-Species Bosonic Hubbard Model.” <i>Physical Review B</i>, vol. 108, no. 5, 054201, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/physrevb.108.054201\">10.1103/physrevb.108.054201</a>.","ista":"Brighi P, Ljubotina M, Abanin DA, Serbyn M. 2023. Many-body localization proximity effect in a two-species bosonic Hubbard model. Physical Review B. 108(5), 054201.","short":"P. Brighi, M. Ljubotina, D.A. Abanin, M. Serbyn, Physical Review B 108 (2023)."},"oa":1,"file":[{"file_size":3051398,"relation":"main_file","file_id":"13981","creator":"dernst","date_created":"2023-08-07T09:48:08Z","access_level":"open_access","content_type":"application/pdf","file_name":"2023_PhysRevB_Brighi.pdf","date_updated":"2023-08-07T09:48:08Z","checksum":"f763000339b5fd543c14377109920690","success":1}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"last_name":"Brighi","orcid":"0000-0002-7969-2729","first_name":"Pietro","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","full_name":"Brighi, Pietro"},{"orcid":"0000-0003-0038-7068","last_name":"Ljubotina","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","first_name":"Marko"},{"full_name":"Abanin, Dmitry A.","first_name":"Dmitry A.","last_name":"Abanin"},{"first_name":"Maksym","full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827","last_name":"Serbyn"}],"project":[{"grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020"}],"publication_status":"published","article_type":"original","acknowledgement":"We thank A. A. Michailidis and A. Mirlin for insightful discussions. P.B., M.L., and M.S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). D.A. was\r\nsupported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 864597) and by the Swiss National Science Foundation. P.B., M.L., and M.S. acknowledge PRACE for awarding us access to Joliot-Curie at GENCI@CEA, France, where the TEBD simulations were performed. The TEBD simulations were performed using the ITensor library [60].","ddc":["530"],"arxiv":1,"status":"public","abstract":[{"text":"The many-body localization (MBL) proximity effect is an intriguing phenomenon where a thermal bath localizes due to the interaction with a disordered system. The interplay of thermal and nonergodic behavior in these systems gives rise to a rich phase diagram, whose exploration is an active field of research. In this paper, we study a bosonic Hubbard model featuring two particle species representing the bath and the disordered system. Using state-of-the-art numerical techniques, we investigate the dynamics of the model in different regimes, based on which we obtain a tentative phase diagram as a function of coupling strength and bath size. When the bath is composed of a single particle, we observe clear signatures of a transition from an MBL proximity effect to a delocalized phase. Increasing the bath size, however, its thermalizing effect becomes stronger and eventually the whole system delocalizes in the range of moderate interaction strengths studied. In this regime, we characterize particle transport, revealing diffusive behavior of the originally localized bosons.","lang":"eng"}],"scopus_import":"1","date_published":"2023-08-01T00:00:00Z","month":"08","article_processing_charge":"Yes (in subscription journal)","title":"Many-body localization proximity effect in a two-species bosonic Hubbard model","oa_version":"Published Version","year":"2023","issue":"5","_id":"13963"},{"author":[{"last_name":"Henderson","orcid":"0000-0002-5198-7445","full_name":"Henderson, Paul M","id":"13C09E74-18D9-11E9-8878-32CFE5697425","first_name":"Paul M"},{"first_name":"Areg","full_name":"Ghazaryan, Areg","id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87","last_name":"Ghazaryan","orcid":"0000-0001-9666-3543"},{"full_name":"Zibrov, Alexander A.","first_name":"Alexander A.","last_name":"Zibrov"},{"last_name":"Young","full_name":"Young, Andrea F.","first_name":"Andrea F."},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym"}],"publication_status":"published","article_type":"original","oa":1,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","status":"public","scopus_import":"1","date_published":"2023-09-15T00:00:00Z","abstract":[{"text":"The development of two-dimensional materials has resulted in a diverse range of novel, high-quality compounds with increasing complexity. A key requirement for a comprehensive quantitative theory is the accurate determination of these materials' band structure parameters. However, this task is challenging due to the intricate band structures and the indirect nature of experimental probes. In this work, we introduce a general framework to derive band structure parameters from experimental data using deep neural networks. We applied our method to the penetration field capacitance measurement of trilayer graphene, an effective probe of its density of states. First, we demonstrate that a trained deep network gives accurate predictions for the penetration field capacitance as a function of tight-binding parameters. Next, we use the fast and accurate predictions from the trained network to automatically determine tight-binding parameters directly from experimental data, with extracted parameters being in a good agreement with values in the literature. We conclude by discussing potential applications of our method to other materials and experimental techniques beyond penetration field capacitance.","lang":"eng"}],"arxiv":1,"acknowledgement":"A.F.Y. acknowledges primary support from the Department of Energy under award DE-SC0020043, and additional support from the Gordon and Betty Moore Foundation under award GBMF9471 for group operations.","article_processing_charge":"No","month":"09","oa_version":"Preprint","_id":"14320","issue":"12","year":"2023","title":"Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene","department":[{"_id":"MaSe"},{"_id":"ChLa"},{"_id":"MiLe"}],"article_number":"125411","date_created":"2023-09-12T07:12:12Z","publication_identifier":{"eissn":["2469-9969"],"issn":["2469-9950"]},"language":[{"iso":"eng"}],"quality_controlled":"1","intvolume":"       108","external_id":{"arxiv":["2210.06310"]},"date_updated":"2023-09-20T09:38:24Z","publication":"Physical Review B","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2210.06310"}],"volume":108,"citation":{"ama":"Henderson PM, Ghazaryan A, Zibrov AA, Young AF, Serbyn M. Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene. <i>Physical Review B</i>. 2023;108(12). doi:<a href=\"https://doi.org/10.1103/physrevb.108.125411\">10.1103/physrevb.108.125411</a>","chicago":"Henderson, Paul M, Areg Ghazaryan, Alexander A. Zibrov, Andrea F. Young, and Maksym Serbyn. “Deep Learning Extraction of Band Structure Parameters from Density of States: A Case Study on Trilayer Graphene.” <i>Physical Review B</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/physrevb.108.125411\">https://doi.org/10.1103/physrevb.108.125411</a>.","short":"P.M. Henderson, A. Ghazaryan, A.A. Zibrov, A.F. Young, M. Serbyn, Physical Review B 108 (2023).","ieee":"P. M. Henderson, A. Ghazaryan, A. A. Zibrov, A. F. Young, and M. Serbyn, “Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene,” <i>Physical Review B</i>, vol. 108, no. 12. American Physical Society, 2023.","apa":"Henderson, P. M., Ghazaryan, A., Zibrov, A. A., Young, A. F., &#38; Serbyn, M. (2023). Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.108.125411\">https://doi.org/10.1103/physrevb.108.125411</a>","ista":"Henderson PM, Ghazaryan A, Zibrov AA, Young AF, Serbyn M. 2023. Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene. Physical Review B. 108(12), 125411.","mla":"Henderson, Paul M., et al. “Deep Learning Extraction of Band Structure Parameters from Density of States: A Case Study on Trilayer Graphene.” <i>Physical Review B</i>, vol. 108, no. 12, 125411, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/physrevb.108.125411\">10.1103/physrevb.108.125411</a>."},"type":"journal_article","publisher":"American Physical Society","doi":"10.1103/physrevb.108.125411","day":"15"},{"has_accepted_license":"1","date_updated":"2025-04-14T07:52:05Z","corr_author":"1","external_id":{"arxiv":["2210.15607"]},"quality_controlled":"1","language":[{"iso":"eng"}],"intvolume":"        15","publication_identifier":{"issn":["2542-4653"]},"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"file_date_updated":"2023-09-20T10:46:10Z","date_created":"2023-09-14T13:08:23Z","department":[{"_id":"MaSe"}],"article_number":"093","doi":"10.21468/scipostphys.15.3.093","day":"13","publisher":"SciPost Foundation","type":"journal_article","ec_funded":1,"related_material":{"record":[{"status":"public","relation":"earlier_version","id":"12750"}]},"citation":{"ama":"Brighi P, Ljubotina M, Serbyn M. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. <i>SciPost Physics</i>. 2023;15(3). doi:<a href=\"https://doi.org/10.21468/scipostphys.15.3.093\">10.21468/scipostphys.15.3.093</a>","chicago":"Brighi, Pietro, Marko Ljubotina, and Maksym Serbyn. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” <i>SciPost Physics</i>. SciPost Foundation, 2023. <a href=\"https://doi.org/10.21468/scipostphys.15.3.093\">https://doi.org/10.21468/scipostphys.15.3.093</a>.","short":"P. Brighi, M. Ljubotina, M. Serbyn, SciPost Physics 15 (2023).","ieee":"P. Brighi, M. Ljubotina, and M. Serbyn, “Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models,” <i>SciPost Physics</i>, vol. 15, no. 3. SciPost Foundation, 2023.","mla":"Brighi, Pietro, et al. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” <i>SciPost Physics</i>, vol. 15, no. 3, 093, SciPost Foundation, 2023, doi:<a href=\"https://doi.org/10.21468/scipostphys.15.3.093\">10.21468/scipostphys.15.3.093</a>.","apa":"Brighi, P., Ljubotina, M., &#38; Serbyn, M. (2023). Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. <i>SciPost Physics</i>. SciPost Foundation. <a href=\"https://doi.org/10.21468/scipostphys.15.3.093\">https://doi.org/10.21468/scipostphys.15.3.093</a>","ista":"Brighi P, Ljubotina M, Serbyn M. 2023. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. SciPost Physics. 15(3), 093."},"volume":15,"publication":"SciPost Physics","arxiv":1,"ddc":["530"],"acknowledgement":"We would like to thank Raimel A. Medina, Hansveer Singh, and Dmitry Abanin for useful\r\ndiscussions.The authors acknowledge support by the European Research Council\r\n(ERC) under the European Union’s Horizon 2020 research and innovation program (Grant\r\nAgreement No. 850899). We acknowledge support by the Erwin Schrödinger International\r\nInstitute for Mathematics and Physics (ESI).","scopus_import":"1","abstract":[{"lang":"eng","text":"Quantum kinetically constrained models have recently attracted significant attention due to their anomalous dynamics and thermalization. In this work, we introduce a hitherto unexplored family of kinetically constrained models featuring conserved particle number and strong inversion-symmetry breaking due to facilitated hopping. We demonstrate that these models provide a generic example of so-called quantum Hilbert space fragmentation, that is manifested in disconnected sectors in the Hilbert space that are not apparent in the computational basis. Quantum Hilbert space fragmentation leads to an exponential in system size number of eigenstates with exactly zero entanglement entropy across several bipartite cuts. These eigenstates can be probed dynamically using quenches from simple initial product states. In addition, we study the particle spreading under unitary dynamics launched from the domain wall state, and find faster than diffusive dynamics at high particle densities, that crosses over into logarithmically slow relaxation at smaller densities. Using a classically simulable cellular automaton, we reproduce the logarithmic dynamics observed in the quantum case. Our work suggests that particle conserving constrained models with inversion symmetry breaking realize so far unexplored dynamical behavior and invite their further theoretical and experimental studies."}],"date_published":"2023-09-13T00:00:00Z","status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","file":[{"success":1,"checksum":"4cef6a8021f6b6c47ab2f2f2b1387ac2","file_name":"2023_SciPostPhysics_Brighi.pdf","date_updated":"2023-09-20T10:46:10Z","content_type":"application/pdf","date_created":"2023-09-20T10:46:10Z","creator":"dernst","access_level":"open_access","file_id":"14350","file_size":4866506,"relation":"main_file"}],"oa":1,"article_type":"original","publication_status":"published","project":[{"name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E"}],"author":[{"id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","full_name":"Brighi, Pietro","first_name":"Pietro","last_name":"Brighi","orcid":"0000-0002-7969-2729"},{"last_name":"Ljubotina","orcid":"0000-0003-0038-7068","first_name":"Marko","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E"},{"last_name":"Serbyn","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","first_name":"Maksym"}],"keyword":["General Physics and Astronomy"],"title":"Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models","issue":"3","_id":"14334","year":"2023","oa_version":"Published Version","month":"09","article_processing_charge":"No"},{"volume":107,"citation":{"chicago":"Ghazaryan, Areg, Tobias Holder, Erez Berg, and Maksym Serbyn. “Multilayer Graphenes as a Platform for Interaction-Driven Physics and Topological Superconductivity.” <i>Physical Review B</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/PhysRevB.107.104502\">https://doi.org/10.1103/PhysRevB.107.104502</a>.","ama":"Ghazaryan A, Holder T, Berg E, Serbyn M. Multilayer graphenes as a platform for interaction-driven physics and topological superconductivity. <i>Physical Review B</i>. 2023;107(10). doi:<a href=\"https://doi.org/10.1103/PhysRevB.107.104502\">10.1103/PhysRevB.107.104502</a>","apa":"Ghazaryan, A., Holder, T., Berg, E., &#38; Serbyn, M. (2023). Multilayer graphenes as a platform for interaction-driven physics and topological superconductivity. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevB.107.104502\">https://doi.org/10.1103/PhysRevB.107.104502</a>","mla":"Ghazaryan, Areg, et al. “Multilayer Graphenes as a Platform for Interaction-Driven Physics and Topological Superconductivity.” <i>Physical Review B</i>, vol. 107, no. 10, 104502, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/PhysRevB.107.104502\">10.1103/PhysRevB.107.104502</a>.","ista":"Ghazaryan A, Holder T, Berg E, Serbyn M. 2023. Multilayer graphenes as a platform for interaction-driven physics and topological superconductivity. Physical Review B. 107(10), 104502.","ieee":"A. Ghazaryan, T. Holder, E. Berg, and M. Serbyn, “Multilayer graphenes as a platform for interaction-driven physics and topological superconductivity,” <i>Physical Review B</i>, vol. 107, no. 10. American Physical Society, 2023.","short":"A. Ghazaryan, T. Holder, E. Berg, M. Serbyn, Physical Review B 107 (2023)."},"type":"journal_article","related_material":{"link":[{"url":"https://ista.ac.at/en/news/reaching-superconductivity-layer-by-layer/","description":"News on the ISTA website","relation":"press_release"}]},"doi":"10.1103/PhysRevB.107.104502","publisher":"American Physical Society","day":"01","publication":"Physical Review B","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2211.02492"}],"publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"language":[{"iso":"eng"}],"quality_controlled":"1","intvolume":"       107","external_id":{"isi":["000945526400003"],"arxiv":["2211.02492"]},"date_updated":"2023-08-01T13:59:29Z","department":[{"_id":"MaSe"},{"_id":"MiLe"}],"article_number":"104502","date_created":"2023-04-02T22:01:10Z","oa_version":"Preprint","_id":"12790","issue":"10","year":"2023","title":"Multilayer graphenes as a platform for interaction-driven physics and topological superconductivity","article_processing_charge":"No","month":"03","status":"public","scopus_import":"1","abstract":[{"text":"Motivated by the recent discoveries of superconductivity in bilayer and trilayer graphene, we theoretically investigate superconductivity and other interaction-driven phases in multilayer graphene stacks. To this end, we study the density of states of multilayer graphene with up to four layers at the single-particle band structure level in the presence of a transverse electric field. Among the considered structures, tetralayer graphene with rhombohedral (ABCA) stacking reaches the highest density of states. We study the phases that can arise in ABCA graphene by tuning the carrier density and transverse electric field. For a broad region of the tuning parameters, the presence of strong Coulomb repulsion leads to a spontaneous spin and valley symmetry breaking via Stoner transitions. Using a model that incorporates the spontaneous spin and valley polarization, we explore the Kohn-Luttinger mechanism for superconductivity driven by repulsive Coulomb interactions. We find that the strongest superconducting instability is in the p-wave channel, and occurs in proximity to the onset of Stoner transitions. Interestingly, we find a range of densities and transverse electric fields where superconductivity develops out of a strongly corrugated, singly connected Fermi surface in each valley, leading to a topologically nontrivial chiral p+ip superconducting state with an even number of copropagating chiral Majorana edge modes. Our work establishes ABCA-stacked tetralayer graphene as a promising platform for observing strongly correlated physics and topological superconductivity.","lang":"eng"}],"date_published":"2023-03-01T00:00:00Z","arxiv":1,"acknowledgement":"E.B. and T.H. were supported by the European Research Council (ERC) under grant HQMAT (Grant Agreement No. 817799), by the Israel-USA Binational Science Foundation (BSF), and by a Research grant from Irving and Cherna Moskowitz.","author":[{"last_name":"Ghazaryan","orcid":"0000-0001-9666-3543","first_name":"Areg","id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87","full_name":"Ghazaryan, Areg"},{"last_name":"Holder","full_name":"Holder, Tobias","first_name":"Tobias"},{"full_name":"Berg, Erez","first_name":"Erez","last_name":"Berg"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","first_name":"Maksym","last_name":"Serbyn","orcid":"0000-0002-2399-5827"}],"article_type":"original","publication_status":"published","oa":1,"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","isi":1},{"volume":13,"citation":{"short":"M. Ljubotina, J.Y. Desaules, M. Serbyn, Z. Papić, Physical Review X 13 (2023).","ieee":"M. Ljubotina, J. Y. Desaules, M. Serbyn, and Z. Papić, “Superdiffusive energy transport in kinetically constrained models,” <i>Physical Review X</i>, vol. 13, no. 1. American Physical Society, 2023.","apa":"Ljubotina, M., Desaules, J. Y., Serbyn, M., &#38; Papić, Z. (2023). Superdiffusive energy transport in kinetically constrained models. <i>Physical Review X</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevX.13.011033\">https://doi.org/10.1103/PhysRevX.13.011033</a>","ista":"Ljubotina M, Desaules JY, Serbyn M, Papić Z. 2023. Superdiffusive energy transport in kinetically constrained models. Physical Review X. 13(1), 011033.","mla":"Ljubotina, Marko, et al. “Superdiffusive Energy Transport in Kinetically Constrained Models.” <i>Physical Review X</i>, vol. 13, no. 1, 011033, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/PhysRevX.13.011033\">10.1103/PhysRevX.13.011033</a>.","ama":"Ljubotina M, Desaules JY, Serbyn M, Papić Z. Superdiffusive energy transport in kinetically constrained models. <i>Physical Review X</i>. 2023;13(1). doi:<a href=\"https://doi.org/10.1103/PhysRevX.13.011033\">10.1103/PhysRevX.13.011033</a>","chicago":"Ljubotina, Marko, Jean Yves Desaules, Maksym Serbyn, and Zlatko Papić. “Superdiffusive Energy Transport in Kinetically Constrained Models.” <i>Physical Review X</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/PhysRevX.13.011033\">https://doi.org/10.1103/PhysRevX.13.011033</a>."},"type":"journal_article","ec_funded":1,"publisher":"American Physical Society","day":"07","doi":"10.1103/PhysRevX.13.011033","publication":"Physical Review X","publication_identifier":{"eissn":["2160-3308"]},"intvolume":"        13","quality_controlled":"1","language":[{"iso":"eng"}],"external_id":{"isi":["000957625700001"]},"corr_author":"1","date_updated":"2025-04-14T07:52:07Z","has_accepted_license":"1","article_number":"011033","department":[{"_id":"MaSe"}],"file_date_updated":"2023-04-17T08:36:53Z","date_created":"2023-04-16T22:01:09Z","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"oa_version":"Published Version","year":"2023","issue":"1","_id":"12839","title":"Superdiffusive energy transport in kinetically constrained models","article_processing_charge":"No","month":"03","status":"public","scopus_import":"1","abstract":[{"text":"Universal nonequilibrium properties of isolated quantum systems are typically probed by studying transport of conserved quantities, such as charge or spin, while transport of energy has received considerably less attention. Here, we study infinite-temperature energy transport in the kinetically constrained PXP model describing Rydberg atom quantum simulators. Our state-of-the-art numerical simulations, including exact diagonalization and time-evolving block decimation methods, reveal the existence of two distinct transport regimes. At moderate times, the energy-energy correlation function displays periodic oscillations due to families of eigenstates forming different su(2) representations hidden within the spectrum. These families of eigenstates generalize the quantum many-body scarred states found in previous works and leave an imprint on the infinite-temperature energy transport. At later times, we observe a long-lived superdiffusive transport regime that we attribute to the proximity of a nearby integrable point. While generic strong deformations of the PXP model indeed restore diffusive transport, adding a strong chemical potential intriguingly gives rise to a well-converged superdiffusive exponent z≈3/2. Our results suggest constrained models to be potential hosts of novel transport regimes and call for developing an analytic understanding of their energy transport.","lang":"eng"}],"date_published":"2023-03-07T00:00:00Z","acknowledgement":"We would like to thank Alexios Michailidis, Sarang Gopalakrishnan, and Achilleas Lazarides for useful comments. M. L. and M. S. acknowledge support by the European Research Council under the European Union’s Horizon 2020 research and innovation program (Grant\r\nAgreement No. 850899). J.-Y. D. and Z. P. acknowledge support by EPSRC Grant No. EP/R513258/1 and the Leverhulme Trust Research Leadership Grant No. RL2019-015. Statement of compliance with EPSRC policy framework on research data: This publication is theoretical work that does not require supporting research data. M. S., M. L., and Z. P. acknowledge support by the Erwin Schrödinger International Institute for Mathematics and\r\nPhysics. M. L. and M. S. acknowledge PRACE for awarding us access to Joliot-Curie at GENCI@CEA, France, where the TEBD simulations were performed. The TEBD\r\nsimulations were performed using the ITENSOR library [54].","ddc":["530"],"author":[{"orcid":"0000-0003-0038-7068","last_name":"Ljubotina","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","first_name":"Marko"},{"full_name":"Desaules, Jean Yves","first_name":"Jean Yves","last_name":"Desaules"},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym"},{"last_name":"Papić","first_name":"Zlatko","full_name":"Papić, Zlatko"}],"project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020"}],"article_type":"original","publication_status":"published","oa":1,"file":[{"content_type":"application/pdf","creator":"dernst","date_created":"2023-04-17T08:36:53Z","access_level":"open_access","file_id":"12845","relation":"main_file","file_size":1958523,"success":1,"checksum":"ee060cea609af79bba7af74b1ce28078","file_name":"2023_PhysReviewX_Ljubotina.pdf","date_updated":"2023-04-17T08:36:53Z"}],"isi":1,"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8"},{"publication":"Physical Review A","ec_funded":1,"type":"journal_article","related_material":{"record":[{"id":"17208","relation":"dissertation_contains","status":"public"},{"id":"14622","relation":"dissertation_contains","status":"public"}]},"doi":"10.1103/physreva.107.062404","publisher":"American Physical Society","day":"02","volume":107,"citation":{"ieee":"S. Sack, R. A. Medina Ramos, R. Kueng, and M. Serbyn, “Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement,” <i>Physical Review A</i>, vol. 107, no. 6. American Physical Society, 2023.","ista":"Sack S, Medina Ramos RA, Kueng R, Serbyn M. 2023. Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. Physical Review A. 107(6), 062404.","mla":"Sack, Stefan, et al. “Recursive Greedy Initialization of the Quantum Approximate Optimization Algorithm with Guaranteed Improvement.” <i>Physical Review A</i>, vol. 107, no. 6, 062404, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/physreva.107.062404\">10.1103/physreva.107.062404</a>.","apa":"Sack, S., Medina Ramos, R. A., Kueng, R., &#38; Serbyn, M. (2023). Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. <i>Physical Review A</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physreva.107.062404\">https://doi.org/10.1103/physreva.107.062404</a>","short":"S. Sack, R.A. Medina Ramos, R. Kueng, M. Serbyn, Physical Review A 107 (2023).","chicago":"Sack, Stefan, Raimel A Medina Ramos, Richard Kueng, and Maksym Serbyn. “Recursive Greedy Initialization of the Quantum Approximate Optimization Algorithm with Guaranteed Improvement.” <i>Physical Review A</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/physreva.107.062404\">https://doi.org/10.1103/physreva.107.062404</a>.","ama":"Sack S, Medina Ramos RA, Kueng R, Serbyn M. Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. <i>Physical Review A</i>. 2023;107(6). doi:<a href=\"https://doi.org/10.1103/physreva.107.062404\">10.1103/physreva.107.062404</a>"},"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"department":[{"_id":"MaSe"}],"article_number":"062404","file_date_updated":"2023-06-13T07:28:36Z","date_created":"2023-06-07T06:57:32Z","corr_author":"1","external_id":{"isi":["001016927100012"],"arxiv":["2209.01159"]},"has_accepted_license":"1","date_updated":"2026-05-04T22:30:22Z","publication_identifier":{"issn":["2469-9926"],"eissn":["2469-9934"]},"quality_controlled":"1","language":[{"iso":"eng"}],"intvolume":"       107","month":"06","article_processing_charge":"No","title":"Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement","oa_version":"Published Version","_id":"13125","issue":"6","year":"2023","oa":1,"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","isi":1,"file":[{"file_name":"2023_PhysRevA_Sack.pdf","date_updated":"2023-06-13T07:28:36Z","checksum":"0d71423888eeccaa60d8f41197f26306","success":1,"relation":"main_file","file_size":2524611,"file_id":"13131","date_created":"2023-06-13T07:28:36Z","creator":"dernst","access_level":"open_access","content_type":"application/pdf"}],"author":[{"last_name":"Sack","orcid":"0000-0001-5400-8508","first_name":"Stefan","id":"dd622248-f6e0-11ea-865d-ce382a1c81a5","full_name":"Sack, Stefan"},{"orcid":"0000-0002-5383-2869","last_name":"Medina Ramos","id":"CE680B90-D85A-11E9-B684-C920E6697425","full_name":"Medina Ramos, Raimel A","first_name":"Raimel A"},{"first_name":"Richard","full_name":"Kueng, Richard","last_name":"Kueng"},{"orcid":"0000-0002-2399-5827","last_name":"Serbyn","first_name":"Maksym","full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"}],"article_type":"original","publication_status":"published","project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"arxiv":1,"ddc":["530"],"acknowledgement":"We thank V. Verteletskyi for a joint collaboration on numerical studies of the QAOA during his internship at ISTA that inspired analytic results on TS reported in this work. We acknowledge A. A. Mele and M. Brooks for discussions and D. Egger, P. Love, and D. Wierichs for valuable feedback on the manuscript. S.H.S., R.A.M., and M.S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). R.K. is supported by the SFB BeyondC (Grant No. F7107-N38) and the project QuantumReady (FFG 896217). ","status":"public","date_published":"2023-06-02T00:00:00Z","scopus_import":"1","abstract":[{"text":"The quantum approximate optimization algorithm (QAOA) is a variational quantum algorithm, where a quantum computer implements a variational ansatz consisting of p layers of alternating unitary operators and a classical computer is used to optimize the variational parameters. For a random initialization, the optimization typically leads to local minima with poor performance, motivating the search for initialization strategies of QAOA variational parameters. Although numerous heuristic initializations exist, an analytical understanding and performance guarantees for large p remain evasive.We introduce a greedy initialization of QAOA which guarantees improving performance with an increasing number of layers. Our main result is an analytic construction of 2p + 1 transition states—saddle points with a unique negative curvature direction—for QAOA with p + 1 layers that use the local minimum of QAOA with p layers. Transition states connect to new local minima, which are guaranteed to lower the energy compared to the minimum found for p layers. We use the GREEDY procedure to navigate the exponentially increasing with p number of local minima resulting from the recursive application of our analytic construction. The performance of the GREEDY procedure matches available initialization strategies while providing a guarantee for the minimal energy to decrease with an increasing number of layers p. ","lang":"eng"}]},{"volume":32,"citation":{"ama":"Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. Crises and chaotic scattering in hydrodynamic pilot-wave experiments. <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. 2022;32(9). doi:<a href=\"https://doi.org/10.1063/5.0102904\">10.1063/5.0102904</a>","chicago":"Choueiri, George H, Balachandra Suri, Jack Merrin, Maksym Serbyn, Björn Hof, and Nazmi B Budanur. “Crises and Chaotic Scattering in Hydrodynamic Pilot-Wave Experiments.” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. AIP Publishing, 2022. <a href=\"https://doi.org/10.1063/5.0102904\">https://doi.org/10.1063/5.0102904</a>.","short":"G.H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, N.B. Budanur, Chaos: An Interdisciplinary Journal of Nonlinear Science 32 (2022).","ieee":"G. H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, and N. B. Budanur, “Crises and chaotic scattering in hydrodynamic pilot-wave experiments,” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>, vol. 32, no. 9. AIP Publishing, 2022.","ista":"Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. 2022. Crises and chaotic scattering in hydrodynamic pilot-wave experiments. Chaos: An Interdisciplinary Journal of Nonlinear Science. 32(9), 093138.","apa":"Choueiri, G. H., Suri, B., Merrin, J., Serbyn, M., Hof, B., &#38; Budanur, N. B. (2022). Crises and chaotic scattering in hydrodynamic pilot-wave experiments. <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. AIP Publishing. <a href=\"https://doi.org/10.1063/5.0102904\">https://doi.org/10.1063/5.0102904</a>","mla":"Choueiri, George H., et al. “Crises and Chaotic Scattering in Hydrodynamic Pilot-Wave Experiments.” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>, vol. 32, no. 9, 093138, AIP Publishing, 2022, doi:<a href=\"https://doi.org/10.1063/5.0102904\">10.1063/5.0102904</a>."},"type":"journal_article","publisher":"AIP Publishing","day":"26","doi":"10.1063/5.0102904","publication":"Chaos: An Interdisciplinary Journal of Nonlinear Science","publication_identifier":{"eissn":["1089-7682"],"issn":["1054-1500"]},"intvolume":"        32","language":[{"iso":"eng"}],"quality_controlled":"1","external_id":{"pmid":["36182399"],"isi":["000861009600005"],"arxiv":["2206.01531"]},"date_updated":"2025-06-11T13:41:34Z","has_accepted_license":"1","article_number":"093138","department":[{"_id":"MaSe"},{"_id":"BjHo"},{"_id":"NanoFab"}],"file_date_updated":"2023-01-30T09:41:12Z","date_created":"2023-01-16T09:58:16Z","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"oa_version":"Published Version","year":"2022","issue":"9","_id":"12259","title":"Crises and chaotic scattering in hydrodynamic pilot-wave experiments","keyword":["Applied Mathematics","General Physics and Astronomy","Mathematical Physics","Statistical and Nonlinear Physics"],"article_processing_charge":"No","month":"09","pmid":1,"status":"public","abstract":[{"lang":"eng","text":"Theoretical foundations of chaos have been predominantly laid out for finite-dimensional dynamical systems, such as the three-body problem in classical mechanics and the Lorenz model in dissipative systems. In contrast, many real-world chaotic phenomena, e.g., weather, arise in systems with many (formally infinite) degrees of freedom, which limits direct quantitative analysis of such systems using chaos theory. In the present work, we demonstrate that the hydrodynamic pilot-wave systems offer a bridge between low- and high-dimensional chaotic phenomena by allowing for a systematic study of how the former connects to the latter. Specifically, we present experimental results, which show the formation of low-dimensional chaotic attractors upon destabilization of regular dynamics and a final transition to high-dimensional chaos via the merging of distinct chaotic regions through a crisis bifurcation. Moreover, we show that the post-crisis dynamics of the system can be rationalized as consecutive scatterings from the nonattracting chaotic sets with lifetimes following exponential distributions. "}],"scopus_import":"1","date_published":"2022-09-26T00:00:00Z","acknowledgement":"This work was partially funded by the Institute of Science and Technology Austria Interdisciplinary Project Committee Grant “Pilot-Wave Hydrodynamics: Chaos and Quantum Analogies.”","ddc":["530"],"arxiv":1,"author":[{"id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","full_name":"Choueiri, George H","first_name":"George H","last_name":"Choueiri"},{"first_name":"Balachandra","full_name":"Suri, Balachandra","id":"47A5E706-F248-11E8-B48F-1D18A9856A87","last_name":"Suri"},{"full_name":"Merrin, Jack","id":"4515C308-F248-11E8-B48F-1D18A9856A87","first_name":"Jack","orcid":"0000-0001-5145-4609","last_name":"Merrin"},{"last_name":"Serbyn","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","first_name":"Maksym"},{"orcid":"0000-0003-2057-2754","last_name":"Hof","full_name":"Hof, Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87","first_name":"Björn"},{"last_name":"Budanur","orcid":"0000-0003-0423-5010","full_name":"Budanur, Nazmi B","id":"3EA1010E-F248-11E8-B48F-1D18A9856A87","first_name":"Nazmi B"}],"publication_status":"published","article_type":"original","oa":1,"file":[{"file_size":3209644,"relation":"main_file","file_id":"12445","date_created":"2023-01-30T09:41:12Z","creator":"dernst","access_level":"open_access","content_type":"application/pdf","file_name":"2022_Chaos_Choueiri.pdf","date_updated":"2023-01-30T09:41:12Z","checksum":"17881eff8b21969359a2dd64620120ba","success":1}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","isi":1},{"month":"09","article_processing_charge":"No","keyword":["General Medicine"],"title":"Optimal steering of matrix product states and quantum many-body scars","oa_version":"Published Version","issue":"3","_id":"12276","year":"2022","oa":1,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","file":[{"date_updated":"2023-01-30T11:02:50Z","file_name":"2022_PRXQuantum_Ljubotina.pdf","success":1,"checksum":"ef8f0a1b5a019b3958009162de0fa4c3","file_id":"12457","relation":"main_file","file_size":7661905,"content_type":"application/pdf","access_level":"open_access","date_created":"2023-01-30T11:02:50Z","creator":"dernst"}],"author":[{"orcid":"0000-0003-0038-7068","last_name":"Ljubotina","first_name":"Marko","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E"},{"full_name":"Roos, Barbara","id":"5DA90512-D80F-11E9-8994-2E2EE6697425","first_name":"Barbara","last_name":"Roos","orcid":"0000-0002-9071-5880"},{"last_name":"Abanin","full_name":"Abanin, Dmitry A.","first_name":"Dmitry A."},{"last_name":"Serbyn","orcid":"0000-0002-2399-5827","first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym"}],"article_type":"original","publication_status":"published","project":[{"grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"arxiv":1,"ddc":["530"],"acknowledgement":"We thank A. A. Michailidis for insightful discussions. M.L. and M.S. acknowledge support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 850899). D.A. is supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 864597) and by the Swiss National Science Foundation. The infinite TEBD simulations were performed using the ITensor library [67].","status":"public","date_published":"2022-09-23T00:00:00Z","abstract":[{"text":"Ongoing development of quantum simulators allows for a progressively finer degree of control of quantum many-body systems. This motivates the development of efficient approaches to facilitate the control of such systems and enable the preparation of nontrivial quantum states. Here we formulate an approach to control quantum systems based on matrix product states (MPSs). We compare counterdiabatic and leakage minimization approaches to the so-called local steering problem that consists in finding the best value of the control parameters for generating a unitary evolution of the specific MPS in a given direction. In order to benchmark the different approaches, we apply them to the generalization of the PXP model known to exhibit coherent quantum dynamics due to quantum many-body scars. We find that the leakage-based approach generally outperforms the counterdiabatic framework and use it to construct a Floquet model with quantum scars. We perform the first steps towards global trajectory optimization and demonstrate entanglement steering capabilities in the generalized PXP model. Finally, we apply our leakage minimization approach to construct quantum scars in the periodically driven nonintegrable Ising model.","lang":"eng"}],"scopus_import":"1","publication":"PRX Quantum","ec_funded":1,"type":"journal_article","day":"23","doi":"10.1103/prxquantum.3.030343","publisher":"American Physical Society","volume":3,"citation":{"mla":"Ljubotina, Marko, et al. “Optimal Steering of Matrix Product States and Quantum Many-Body Scars.” <i>PRX Quantum</i>, vol. 3, no. 3, 030343, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/prxquantum.3.030343\">10.1103/prxquantum.3.030343</a>.","apa":"Ljubotina, M., Roos, B., Abanin, D. A., &#38; Serbyn, M. (2022). Optimal steering of matrix product states and quantum many-body scars. <i>PRX Quantum</i>. American Physical Society. <a href=\"https://doi.org/10.1103/prxquantum.3.030343\">https://doi.org/10.1103/prxquantum.3.030343</a>","ista":"Ljubotina M, Roos B, Abanin DA, Serbyn M. 2022. Optimal steering of matrix product states and quantum many-body scars. PRX Quantum. 3(3), 030343.","ieee":"M. Ljubotina, B. Roos, D. A. Abanin, and M. Serbyn, “Optimal steering of matrix product states and quantum many-body scars,” <i>PRX Quantum</i>, vol. 3, no. 3. American Physical Society, 2022.","short":"M. Ljubotina, B. Roos, D.A. Abanin, M. Serbyn, PRX Quantum 3 (2022).","chicago":"Ljubotina, Marko, Barbara Roos, Dmitry A. Abanin, and Maksym Serbyn. “Optimal Steering of Matrix Product States and Quantum Many-Body Scars.” <i>PRX Quantum</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/prxquantum.3.030343\">https://doi.org/10.1103/prxquantum.3.030343</a>.","ama":"Ljubotina M, Roos B, Abanin DA, Serbyn M. Optimal steering of matrix product states and quantum many-body scars. <i>PRX Quantum</i>. 2022;3(3). doi:<a href=\"https://doi.org/10.1103/prxquantum.3.030343\">10.1103/prxquantum.3.030343</a>"},"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"department":[{"_id":"MaSe"},{"_id":"RoSe"}],"article_number":"030343","date_created":"2023-01-16T10:01:56Z","file_date_updated":"2023-01-30T11:02:50Z","corr_author":"1","external_id":{"arxiv":["2204.02899"]},"has_accepted_license":"1","date_updated":"2025-04-14T07:52:07Z","publication_identifier":{"eissn":["2691-3399"]},"quality_controlled":"1","language":[{"iso":"eng"}],"intvolume":"         3"}]