[{"has_accepted_license":"1","publisher":"American Physical Society","file":[{"date_created":"2026-03-23T15:35:27Z","success":1,"access_level":"open_access","date_updated":"2026-03-23T15:35:27Z","file_size":500041,"content_type":"application/pdf","checksum":"12b16ce2d49c62b2909da95121bfaadb","file_id":"21491","relation":"main_file","file_name":"2026_PhysicalReviewLetters_Votto.pdf","creator":"dernst"}],"publication":"Physical Review Letters","status":"public","citation":{"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.","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>.","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>","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>","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.","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>.","short":"M. Votto, M. Ljubotina, C. Lancien, J.I. Cirac, P. Zoller, M. Serbyn, L. Piroli, B. Vermersch, Physical Review Letters 136 (2026)."},"article_number":"090801","ddc":["530"],"OA_type":"hybrid","year":"2026","author":[{"first_name":"Matteo","last_name":"Votto","full_name":"Votto, Matteo"},{"last_name":"Ljubotina","first_name":"Marko","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","orcid":"0000-0003-0038-7068"},{"full_name":"Lancien, Cécilia","first_name":"Cécilia","last_name":"Lancien"},{"full_name":"Cirac, J. Ignacio","last_name":"Cirac","first_name":"J. Ignacio"},{"full_name":"Zoller, Peter","last_name":"Zoller","first_name":"Peter"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827","full_name":"Serbyn, Maksym","first_name":"Maksym","last_name":"Serbyn"},{"full_name":"Piroli, Lorenzo","last_name":"Piroli","first_name":"Lorenzo"},{"full_name":"Vermersch, Benoît","last_name":"Vermersch","first_name":"Benoît"}],"date_updated":"2026-03-23T15:39:34Z","quality_controlled":"1","article_type":"original","oa":1,"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"day":"04","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","OA_place":"publisher","volume":136,"PlanS_conform":"1","issue":"9","language":[{"iso":"eng"}],"publication_status":"published","intvolume":"       136","_id":"21480","date_published":"2026-03-04T00:00:00Z","abstract":[{"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.","lang":"eng"}],"month":"03","arxiv":1,"type":"journal_article","file_date_updated":"2026-03-23T15:35:27Z","external_id":{"arxiv":["2507.12550"]},"publication_identifier":{"eissn":["1079-7114"],"issn":["0031-9007"]},"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).","department":[{"_id":"MaSe"}],"title":"Learning mixed quantum states in large-scale experiments","article_processing_charge":"Yes (in subscription journal)","doi":"10.1103/rbg2-f61m","oa_version":"Published Version","date_created":"2026-03-23T14:56:32Z"},{"publisher":"American Physical Society","file":[{"relation":"main_file","file_id":"21505","creator":"dernst","file_name":"2026_PRXQuantum_Nicolau.pdf","content_type":"application/pdf","checksum":"d155ffa9e1a8275702149165f4bf963c","file_size":1848724,"success":1,"date_created":"2026-03-30T06:08:07Z","date_updated":"2026-03-30T06:08:07Z","access_level":"open_access"}],"has_accepted_license":"1","scopus_import":"1","ec_funded":1,"publication":"PRX Quantum","status":"public","article_number":"010352","OA_type":"gold","ddc":["530"],"citation":{"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>.","ista":"Nicolau Jimenez E, Ljubotina M, Serbyn M. 2026. Fragmentation, zero modes, and collective bound states in constrained models. PRX Quantum. 7, 010352.","short":"E. Nicolau Jimenez, M. Ljubotina, M. Serbyn, PRX Quantum 7 (2026).","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>","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.","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>.","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>"},"author":[{"id":"04b4791c-8fd7-11ee-a7df-be2fdc569c48","last_name":"Nicolau Jimenez","first_name":"Eulalia","full_name":"Nicolau Jimenez, Eulalia"},{"id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","orcid":"0000-0003-0038-7068","full_name":"Ljubotina, Marko","last_name":"Ljubotina","first_name":"Marko"},{"last_name":"Serbyn","first_name":"Maksym","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"}],"year":"2026","date_updated":"2026-03-30T06:09:28Z","article_type":"original","quality_controlled":"1","oa":1,"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"day":"13","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","OA_place":"publisher","PlanS_conform":"1","volume":7,"language":[{"iso":"eng"}],"intvolume":"         7","DOAJ_listed":"1","publication_status":"published","_id":"21501","date_published":"2026-03-13T00:00:00Z","type":"journal_article","month":"03","file_date_updated":"2026-03-30T06:08:07Z","arxiv":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. "}],"external_id":{"arxiv":["2504.17627"]},"project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020"}],"publication_identifier":{"eissn":["2691-3399"]},"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).","corr_author":"1","department":[{"_id":"MaSe"}],"title":"Fragmentation, zero modes, and collective bound states in constrained models","oa_version":"Published Version","doi":"10.1103/sl79-1xgb","date_created":"2026-03-28T14:57:56Z","article_processing_charge":"Yes"},{"oa_version":"Published Version","license":"https://creativecommons.org/licenses/by-nc/3.0/","date_created":"2024-12-29T23:01:58Z","doi":"10.1039/d4cp03727h","article_processing_charge":"Yes (via OA deal)","title":"Ab initio Auger spectrum of the ultrafast dissociating 2p3/2−1σ* resonance in HCl","department":[{"_id":"MiLe"},{"_id":"MaSe"}],"acknowledgement":"This publication is based upon work from COST Action CA18212 – Molecular Dynamics in the GAS phase (MD-GAS), supported by COST (European Cooperation in Science and Technology). This work was financially supported by the Slovenian Research Agency in the framework of research program P1-0112 Studies of Atoms, Molecules and Structures by Photons and Particles. Part of this work was financed by the European Research Council (ERC) through the Starting Grant No. 801770 (ANGULON). The authors acknowledge P. Lablanquie, H. Iwayama, F. Penent, K. Soejima and E. Shigemasa for sharing their unpublished experimental spectra on HCl.","corr_author":"1","publication_identifier":{"issn":["1463-9076"]},"external_id":{"pmid":["39698879"],"isi":["001379819100001"]},"project":[{"name":"Angulon: physics and applications of a new quasiparticle","grant_number":"801770","_id":"2688CF98-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"file_date_updated":"2025-04-16T09:46:45Z","type":"journal_article","month":"01","abstract":[{"lang":"eng","text":"We present an ab initio theoretical method to calculate the resonant Auger spectrum in the presence of ultrafast dissociation. The method is demonstrated by deriving the L-VV resonant Auger spectrum mediated by the 2p3/2−1σ* resonance in HCl, where the electronic Auger decay and nuclear dissociation occur on the same time scale. The Auger decay rates are calculated within the one-center approximation and are shown to vary significantly with the inter-nuclear distance. A quantum-mechanical description of dissociation is effectuated by propagating the corresponding Franck–Condon factors. The calculated profiles of Auger spectral lines resemble those of atomic Auger decay but here the characteristic tails extend towards lower electron kinetic energies, which reflect specific features of the potential energy curves. The presented method can describe the resonant Auger spectrum for an arbitrary speed of dissociation and simplifies to known approximations in the limiting cases."}],"date_published":"2025-01-21T00:00:00Z","related_material":{"record":[{"status":"public","relation":"research_data","id":"18716"}]},"_id":"18710","isi":1,"pmid":1,"intvolume":"        27","publication_status":"published","language":[{"iso":"eng"}],"issue":"3","volume":27,"OA_place":"publisher","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","day":"21","tmp":{"name":"Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)","image":"/images/cc_by_nc.png","short":"CC BY-NC (3.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc/3.0/legalcode"},"oa":1,"article_type":"original","quality_controlled":"1","date_updated":"2025-05-19T14:03:19Z","author":[{"last_name":"Hrast","first_name":"Mateja","full_name":"Hrast, Mateja","id":"48dbb294-2a9c-11ef-905d-f56be71f0e5d"},{"orcid":"0000-0003-0038-7068","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","full_name":"Ljubotina, Marko","first_name":"Marko","last_name":"Ljubotina"},{"full_name":"Zitnik, Matjaz","first_name":"Matjaz","last_name":"Zitnik"}],"year":"2025","ddc":["530"],"OA_type":"hybrid","citation":{"ama":"Hrast M, Ljubotina M, Zitnik M. Ab initio Auger spectrum of the ultrafast dissociating 2p3/2−1σ* resonance in HCl. <i>Physical Chemistry Chemical Physics</i>. 2025;27(3):1473-1482. doi:<a href=\"https://doi.org/10.1039/d4cp03727h\">10.1039/d4cp03727h</a>","mla":"Hrast, Mateja, et al. “Ab Initio Auger Spectrum of the Ultrafast Dissociating 2p3/2−1σ* Resonance in HCl.” <i>Physical Chemistry Chemical Physics</i>, vol. 27, no. 3, Royal Society of Chemistry, 2025, pp. 1473–82, doi:<a href=\"https://doi.org/10.1039/d4cp03727h\">10.1039/d4cp03727h</a>.","apa":"Hrast, M., Ljubotina, M., &#38; Zitnik, M. (2025). Ab initio Auger spectrum of the ultrafast dissociating 2p3/2−1σ* resonance in HCl. <i>Physical Chemistry Chemical Physics</i>. Royal Society of Chemistry. <a href=\"https://doi.org/10.1039/d4cp03727h\">https://doi.org/10.1039/d4cp03727h</a>","ieee":"M. Hrast, M. Ljubotina, and M. Zitnik, “Ab initio Auger spectrum of the ultrafast dissociating 2p3/2−1σ* resonance in HCl,” <i>Physical Chemistry Chemical Physics</i>, vol. 27, no. 3. Royal Society of Chemistry, pp. 1473–1482, 2025.","chicago":"Hrast, Mateja, Marko Ljubotina, and Matjaz Zitnik. “Ab Initio Auger Spectrum of the Ultrafast Dissociating 2p3/2−1σ* Resonance in HCl.” <i>Physical Chemistry Chemical Physics</i>. Royal Society of Chemistry, 2025. <a href=\"https://doi.org/10.1039/d4cp03727h\">https://doi.org/10.1039/d4cp03727h</a>.","ista":"Hrast M, Ljubotina M, Zitnik M. 2025. Ab initio Auger spectrum of the ultrafast dissociating 2p3/2−1σ* resonance in HCl. Physical Chemistry Chemical Physics. 27(3), 1473–1482.","short":"M. Hrast, M. Ljubotina, M. Zitnik, Physical Chemistry Chemical Physics 27 (2025) 1473–1482."},"page":"1473-1482","publication":"Physical Chemistry Chemical Physics","status":"public","file":[{"file_size":1270582,"checksum":"d035683179547b41b811107a8649aab0","content_type":"application/pdf","success":1,"date_created":"2025-04-16T09:46:45Z","access_level":"open_access","date_updated":"2025-04-16T09:46:45Z","file_id":"19581","relation":"main_file","file_name":"2025_PCCP_Hrast.pdf","creator":"dernst"}],"publisher":"Royal Society of Chemistry","has_accepted_license":"1","scopus_import":"1","ec_funded":1},{"date_published":"2025-06-12T00:00:00Z","isi":1,"_id":"19833","intvolume":"       111","publication_status":"published","language":[{"iso":"eng"}],"oa_version":"Published Version","date_created":"2025-06-13T06:09:38Z","doi":"10.1103/9fms-ygfz","article_processing_charge":"Yes (in subscription journal)","title":"Probing the many-body localized spin-glass phase through quench dynamics","department":[{"_id":"MaSe"}],"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].","publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"external_id":{"isi":["001511503800006"],"arxiv":["2502.08192"]},"project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020"}],"month":"06","type":"journal_article","arxiv":1,"file_date_updated":"2025-06-23T06:28:17Z","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."}],"date_updated":"2025-09-30T12:48:10Z","author":[{"id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-7969-2729","full_name":"Brighi, Pietro","last_name":"Brighi","first_name":"Pietro"},{"last_name":"Ljubotina","first_name":"Marko","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","orcid":"0000-0003-0038-7068"},{"first_name":"Maksym","last_name":"Serbyn","full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827"}],"year":"2025","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>.","short":"P. Brighi, M. Ljubotina, M. Serbyn, Physical Review B 111 (2025).","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.","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>","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>","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>."},"OA_type":"hybrid","article_number":"L220202","ddc":["530"],"status":"public","publication":"Physical Review B","file":[{"file_size":1082749,"content_type":"application/pdf","checksum":"7941f92124793a383ca132eee2c289c5","date_created":"2025-06-23T06:28:17Z","success":1,"date_updated":"2025-06-23T06:28:17Z","access_level":"open_access","relation":"main_file","file_id":"19861","creator":"dernst","file_name":"2025_PhysReviewB_Brighi.pdf"}],"publisher":"American Physical Society","has_accepted_license":"1","scopus_import":"1","ec_funded":1,"issue":"22","volume":111,"OA_place":"publisher","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","day":"12","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"oa":1,"article_type":"letter_note","quality_controlled":"1"},{"publisher":"American Physical Society","file":[{"relation":"main_file","file_id":"20715","creator":"dernst","file_name":"2025_PhysReviewResearch_Brighi.pdf","success":1,"date_created":"2025-12-01T08:00:19Z","date_updated":"2025-12-01T08:00:19Z","access_level":"open_access","content_type":"application/pdf","file_size":483879,"checksum":"c4e582ab64ab9f8fface70bf2fd31882"}],"scopus_import":"1","has_accepted_license":"1","status":"public","publication":"Physical Review Research","article_number":"L042014","ddc":["530"],"OA_type":"gold","citation":{"chicago":"Brighi, Pietro, Marko Ljubotina, Federico Roccati, and Federico Balducci. “Finite Steady-State Current Defies Non-Hermitian Many-Body Localization.” <i>Physical Review Research</i>. American Physical Society, 2025. <a href=\"https://doi.org/10.1103/crwj-x7j8\">https://doi.org/10.1103/crwj-x7j8</a>.","ista":"Brighi P, Ljubotina M, Roccati F, Balducci F. 2025. Finite steady-state current defies non-Hermitian many-body localization. Physical Review Research. 7(4), L042014.","short":"P. Brighi, M. Ljubotina, F. Roccati, F. Balducci, Physical Review Research 7 (2025).","ieee":"P. Brighi, M. Ljubotina, F. Roccati, and F. Balducci, “Finite steady-state current defies non-Hermitian many-body localization,” <i>Physical Review Research</i>, vol. 7, no. 4. American Physical Society, 2025.","mla":"Brighi, Pietro, et al. “Finite Steady-State Current Defies Non-Hermitian Many-Body Localization.” <i>Physical Review Research</i>, vol. 7, no. 4, L042014, American Physical Society, 2025, doi:<a href=\"https://doi.org/10.1103/crwj-x7j8\">10.1103/crwj-x7j8</a>.","apa":"Brighi, P., Ljubotina, M., Roccati, F., &#38; Balducci, F. (2025). Finite steady-state current defies non-Hermitian many-body localization. <i>Physical Review Research</i>. American Physical Society. <a href=\"https://doi.org/10.1103/crwj-x7j8\">https://doi.org/10.1103/crwj-x7j8</a>","ama":"Brighi P, Ljubotina M, Roccati F, Balducci F. Finite steady-state current defies non-Hermitian many-body localization. <i>Physical Review Research</i>. 2025;7(4). doi:<a href=\"https://doi.org/10.1103/crwj-x7j8\">10.1103/crwj-x7j8</a>"},"author":[{"last_name":"Brighi","first_name":"Pietro","full_name":"Brighi, Pietro","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-7969-2729"},{"last_name":"Ljubotina","first_name":"Marko","full_name":"Ljubotina, Marko","orcid":"0000-0003-0038-7068","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E"},{"full_name":"Roccati, Federico","last_name":"Roccati","first_name":"Federico"},{"first_name":"Federico","last_name":"Balducci","full_name":"Balducci, Federico"}],"year":"2025","date_updated":"2025-12-01T08:02:13Z","article_type":"original","quality_controlled":"1","oa":1,"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"day":"01","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","OA_place":"publisher","PlanS_conform":"1","volume":7,"issue":"4","language":[{"iso":"eng"}],"intvolume":"         7","publication_status":"published","DOAJ_listed":"1","_id":"20709","date_published":"2025-10-01T00:00:00Z","arxiv":1,"type":"journal_article","month":"10","file_date_updated":"2025-12-01T08:00:19Z","abstract":[{"lang":"eng","text":"Non-Hermitian many-body localization (NH MBL) has emerged as a possible scenario for stable localization in open systems, as suggested by spectral indicators identifying a putative transition for finite system sizes. In this work, we shift the focus to dynamical probes, specifically the steady-state spin current, to investigate transport properties in a disordered, non-Hermitian XXZ spin chain. Through exact diagonalization for small systems and tensor-network methods for larger chains, we demonstrate that the steady-state current remains finite and decays exponentially with disorder strength, showing no evidence of a transition up to disorder values far beyond the previously claimed critical point. Our results reveal a stark discrepancy between spectral indicators, which suggest localization, and transport behavior, which indicates delocalization. This highlights the importance of dynamical observables in characterizing NH MBL and suggests that traditional spectral measures may not fully capture the physics of non-Hermitian systems. Additionally, we observe a noncommutativity of limits in system size and time, further complicating the interpretation of finite-size studies. These findings challenge the existence of NH MBL in the studied model and underscore the need for alternative approaches to understanding localization in non-Hermitian settings."}],"external_id":{"arxiv":["2504.02460"]},"publication_identifier":{"eissn":["2643-1564"]},"acknowledgement":"F.B. thanks Giuseppe de Tomasi and Oskar A. Prośniak for discussion. 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 numerical simulations were performed using the ITensor library [73] on the Vienna Scientific Cluster (VSC) and on the MPIPKS HPC cluster. M.L. acknowledges support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy—EXC-2111—390814868. F.R. acknowledges support by the European Union-Next Generation EU with the project “Quantum Optics in Many-Body photonic Environments” (QOMBE) code SOE2024_0000084-CUP B77G24000480006. Open\r\naccess publication funded by Max Planck Society.","department":[{"_id":"MaSe"}],"title":"Finite steady-state current defies non-Hermitian many-body localization","oa_version":"Published Version","doi":"10.1103/crwj-x7j8","date_created":"2025-11-30T23:02:08Z","article_processing_charge":"Yes (via OA deal)"},{"DOAJ_listed":"1","publication_status":"published","intvolume":"         6","language":[{"iso":"eng"}],"date_published":"2025-11-12T00:00:00Z","related_material":{"link":[{"relation":"press_release","url":"https://ista.ac.at/en/news/reaching-for-the-quantum-scars/","description":"News on ISTA website"}]},"_id":"20646","isi":1,"corr_author":"1","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).","publication_identifier":{"eissn":["2691-3399"]},"project":[{"call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E"}],"external_id":{"isi":["001616473700003"],"arxiv":["2504.12472"]},"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."}],"month":"11","arxiv":1,"type":"journal_article","file_date_updated":"2025-11-14T09:44:10Z","article_processing_charge":"Yes","oa_version":"Published Version","date_created":"2025-11-14T09:40:52Z","doi":"10.1103/tldp-kvkd","title":"Finding periodic orbits in projected quantum many-body dynamics","department":[{"_id":"GradSch"},{"_id":"BjHo"},{"_id":"MaSe"}],"article_number":"040333","OA_type":"gold","ddc":["539"],"citation":{"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>","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>.","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.","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>","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>.","short":"E. Petrova, M. Ljubotina, G. Yalniz, M. Serbyn, PRX Quantum 6 (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."},"publication":"PRX Quantum","status":"public","scopus_import":"1","has_accepted_license":"1","ec_funded":1,"file":[{"file_size":2504713,"content_type":"application/pdf","checksum":"5d6d04ac518b4118405334e1ddc7a56d","success":1,"date_created":"2025-11-14T09:44:10Z","access_level":"open_access","date_updated":"2025-11-14T09:44:10Z","relation":"main_file","file_id":"20647","creator":"gyalniz","file_name":"tldp-kvkd.pdf"}],"publisher":"American Physical Society","date_updated":"2026-04-28T13:14:29Z","year":"2025","author":[{"full_name":"Petrova, Elena","last_name":"Petrova","first_name":"Elena","id":"0ac84990-897b-11ed-a09c-f5abb56a4ede"},{"first_name":"Marko","last_name":"Ljubotina","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","orcid":"0000-0003-0038-7068"},{"orcid":"0000-0002-8490-9312","id":"66E74FA2-D8BF-11E9-8249-8DE2E5697425","full_name":"Yalniz, Gökhan","first_name":"Gökhan","last_name":"Yalniz"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827","full_name":"Serbyn, Maksym","last_name":"Serbyn","first_name":"Maksym"}],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"oa":1,"quality_controlled":"1","article_type":"original","issue":"4","volume":6,"PlanS_conform":"1","OA_place":"publisher","user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","day":"12"},{"project":[{"call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E"},{"call_identifier":"H2020","grant_number":"101034413","name":"IST-BRIDGE: International postdoctoral program","_id":"fc2ed2f7-9c52-11eb-aca3-c01059dda49c"}],"external_id":{"arxiv":["2410.18913"],"isi":["001480669300011"],"pmid":["40344113"]},"abstract":[{"lang":"eng","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."}],"month":"04","type":"journal_article","arxiv":1,"file_date_updated":"2025-05-12T07:33:38Z","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.","publication_identifier":{"issn":["0031-9007"],"eissn":["1079-7114"]},"department":[{"_id":"MaSe"}],"article_processing_charge":"Yes (via OA deal)","date_created":"2025-05-11T22:02:38Z","doi":"10.1103/PhysRevLett.134.160401","oa_version":"Published Version","title":"Quantum many-body scars beyond the PXP model in Rydberg simulators","language":[{"iso":"eng"}],"pmid":1,"publication_status":"published","intvolume":"       134","_id":"19664","related_material":{"record":[{"status":"public","id":"19623","relation":"research_data"}],"link":[{"url":"https://ista.ac.at/en/news/a-sky-full-of-quantum-scars/","relation":"press_release","description":"News on ISTA website"}]},"isi":1,"date_published":"2025-04-22T00:00:00Z","oa":1,"quality_controlled":"1","article_type":"original","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"OA_place":"publisher","user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","day":"22","issue":"16","volume":134,"scopus_import":"1","ec_funded":1,"has_accepted_license":"1","publisher":"American Physical Society","file":[{"file_id":"19677","relation":"main_file","file_name":"2025_PhysReviewLetters_Kerschbaumer.pdf","creator":"dernst","checksum":"b7f581291e20f152d0efc64727314ca2","file_size":1028993,"content_type":"application/pdf","success":1,"date_created":"2025-05-12T07:33:38Z","date_updated":"2025-05-12T07:33:38Z","access_level":"open_access"}],"ddc":["530"],"citation":{"short":"A. Kerschbaumer, M. Ljubotina, M. Serbyn, J.-Y.M. Desaules, Physical Review Letters 134 (2025).","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>.","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.","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>.","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>","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."},"article_number":"160401","OA_type":"hybrid","status":"public","publication":"Physical Review Letters","year":"2025","author":[{"id":"ade85a9c-3200-11ee-973b-91c1eb240410","orcid":"0009-0002-2370-8661","last_name":"Kerschbaumer","first_name":"Aron","full_name":"Kerschbaumer, Aron"},{"orcid":"0000-0003-0038-7068","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","full_name":"Ljubotina, Marko","first_name":"Marko","last_name":"Ljubotina"},{"orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym","last_name":"Serbyn","full_name":"Serbyn, Maksym"},{"orcid":"0000-0002-3749-6375","id":"6c292945-a610-11ed-9eec-c3be1ad62a80","first_name":"Jean-Yves Marc","last_name":"Desaules","full_name":"Desaules, Jean-Yves Marc"}],"date_updated":"2026-04-28T13:34:57Z"},{"scopus_import":"1","ec_funded":1,"publisher":"American Physical Society","citation":{"apa":"Brighi, P., &#38; Ljubotina, M. (2024). Anomalous transport in the kinetically constrained quantum East-West model. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevB.110.L100304\">https://doi.org/10.1103/PhysRevB.110.L100304</a>","mla":"Brighi, Pietro, and Marko Ljubotina. “Anomalous Transport in the Kinetically Constrained Quantum East-West Model.” <i>Physical Review B</i>, vol. 110, no. 10, L100304, American Physical Society, 2024, doi:<a href=\"https://doi.org/10.1103/PhysRevB.110.L100304\">10.1103/PhysRevB.110.L100304</a>.","ieee":"P. Brighi and M. Ljubotina, “Anomalous transport in the kinetically constrained quantum East-West model,” <i>Physical Review B</i>, vol. 110, no. 10. American Physical Society, 2024.","ama":"Brighi P, Ljubotina M. Anomalous transport in the kinetically constrained quantum East-West model. <i>Physical Review B</i>. 2024;110(10). doi:<a href=\"https://doi.org/10.1103/PhysRevB.110.L100304\">10.1103/PhysRevB.110.L100304</a>","chicago":"Brighi, Pietro, and Marko Ljubotina. “Anomalous Transport in the Kinetically Constrained Quantum East-West Model.” <i>Physical Review B</i>. American Physical Society, 2024. <a href=\"https://doi.org/10.1103/PhysRevB.110.L100304\">https://doi.org/10.1103/PhysRevB.110.L100304</a>.","ista":"Brighi P, Ljubotina M. 2024. Anomalous transport in the kinetically constrained quantum East-West model. Physical Review B. 110(10), L100304.","short":"P. Brighi, M. Ljubotina, Physical Review B 110 (2024)."},"article_number":"L100304","status":"public","publication":"Physical Review B","year":"2024","author":[{"id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-7969-2729","last_name":"Brighi","first_name":"Pietro","full_name":"Brighi, Pietro"},{"first_name":"Marko","last_name":"Ljubotina","full_name":"Ljubotina, Marko","orcid":"0000-0003-0038-7068","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E"}],"date_updated":"2025-09-08T09:49:29Z","oa":1,"quality_controlled":"1","article_type":"letter_note","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","day":"11","issue":"10","volume":110,"language":[{"iso":"eng"}],"publication_status":"published","intvolume":"       110","_id":"18110","isi":1,"date_published":"2024-09-11T00:00:00Z","project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899","call_identifier":"H2020"}],"external_id":{"isi":["001361617100003"],"arxiv":["2405.02102"]},"abstract":[{"text":"We study a chaotic particle-conserving kinetically constrained model, with a single parameter which allows us to break reflection symmetry. Through extensive numerical simulations we find that the domain wall state shows a variety of dynamical behaviors from localization all the way to ballistic transport, depending on the value of the reflection breaking parameter. Surprisingly, such anomalous behavior is not mirrored in infinite-temperature dynamics, which appear to scale diffusively, in line with expectations for generic interacting models. However, studying the particle density gradient, we show that the lack of reflection symmetry affects infinite-temperature dynamics, resulting in an asymmetric dynamical structure factor. This is in disagreement with normal diffusion and suggests that the model may also exhibit anomalous dynamics at infinite temperature in the thermodynamic limit. Finally, we observe low-entangled eigenstates in the spectrum of the model, a telltale sign of quantum many-body scars.","lang":"eng"}],"month":"09","type":"journal_article","arxiv":1,"corr_author":"1","acknowledgement":"The authors acknowledge useful discussions with M. Serbyn, Z. Papic, and A. Nunnenkamp. ´\r\nP.B. is supported by the Erwin Schrödinger Center for Quantum Science & Technology (ESQ) of the Österreichische Akademie der Wissenschaften (ÖAW) under the Discovery Grant. M.L. acknowledges support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement\r\nNo. 850899). The numerical simulations were performed using the ITensor library [68] on the Vienna Scientific Cluster (VSC).","publication_identifier":{"eissn":["2469-9969"],"issn":["2469-9950"]},"department":[{"_id":"MaSe"}],"article_processing_charge":"No","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2405.02102"}],"doi":"10.1103/PhysRevB.110.L100304","date_created":"2024-09-22T22:01:42Z","oa_version":"Preprint","title":"Anomalous transport in the kinetically constrained quantum East-West model"},{"abstract":[{"lang":"eng","text":"Introducing a class of SU(2) invariant quantum unitary circuits generating chiral transport, we examine the role of broken space-reflection and time-reversal symmetries on spin-transport properties. Upon adjusting parameters of local unitary gates, the dynamics can be either chaotic or integrable. The latter corresponds to a generalization of the space-time discretized (Trotterized) higher-spin quantum Heisenberg chain. We demonstrate that breaking of space-reflection symmetry results in a drift in the dynamical spin susceptibility. Remarkably, we find a universal drift velocity given by a simple formula, which, at zero average magnetization, depends only on the values of SU(2) Casimir invariants associated with local spins. In the integrable case, the drift velocity formula is confirmed analytically based on the exact solution of thermodynamic Bethe ansatz equations. Finally, by inspecting the large fluctuations of the time-integrated current between two halves of the system in stationary maximum-entropy states, we demonstrate violation of the Gallavotti-Cohen symmetry, implying that such states cannot be regarded as equilibrium ones. We show that the scaled cumulant generating function of the time-integrated current instead obeys a generalized fluctuation relation."}],"type":"journal_article","arxiv":1,"month":"09","file_date_updated":"2024-10-07T11:04:12Z","project":[{"call_identifier":"H2020","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899"}],"external_id":{"isi":["001327172800001"],"arxiv":["2406.01571"]},"publication_identifier":{"eissn":["2691-3399"]},"acknowledgement":"The authors thank Denis Bernard, Jérôme Dubail, Hosho Katsura, Kareljan Schoutens, and Alberto Zorzato for stimulating discussions. This work has been supported by: Slovenian Research Agency (ARIS) under Grants No. N1-0219 (T.P., L.Z.), No. N1-0334 (T.P., L.Z.), No. N1-0243 (E.I.), and under Research Program P1-0402 (E.I., T.P., L.Z.). European Research Council (ERC) under Consolidator Grant No. 771536—NEMO (L.Z.), Advanced Grant No.\r\n101096208—QUEST (T.P., L.Z.), and Starting Grant No. 850899—NEQuM (M.L.). Simons Foundation under Simons Junior Fellowship Grant No. 1141511 (Ž.K.). M.L. acknowledges the hospitality of the Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-2210452. Numerical simulations were performed using the ITensor library [117]. ","department":[{"_id":"MaSe"}],"title":"Quantum many-body spin ratchets","article_processing_charge":"Yes","oa_version":"Published Version","doi":"10.1103/PRXQuantum.5.030356","date_created":"2024-10-06T22:01:12Z","language":[{"iso":"eng"}],"publication_status":"published","DOAJ_listed":"1","intvolume":"         5","_id":"18176","isi":1,"date_published":"2024-09-25T00:00:00Z","quality_controlled":"1","article_type":"original","oa":1,"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"day":"25","OA_place":"publisher","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","volume":5,"issue":"3","scopus_import":"1","has_accepted_license":"1","ec_funded":1,"file":[{"content_type":"application/pdf","file_size":1061648,"checksum":"bc230631255d3bcf8bcbbc8fdbfefcf2","date_created":"2024-10-07T11:04:12Z","success":1,"date_updated":"2024-10-07T11:04:12Z","access_level":"open_access","file_id":"18183","relation":"main_file","file_name":"2024_PRXQuantum_Zadnik.pdf","creator":"dernst"}],"publisher":"American Physical Society","publication":"PRX Quantum","status":"public","ddc":["530"],"OA_type":"gold","article_number":"030356","citation":{"ama":"Zadnik L, Ljubotina M, Krajnik Ž, Ilievski E, Prosen T. Quantum many-body spin ratchets. <i>PRX Quantum</i>. 2024;5(3). doi:<a href=\"https://doi.org/10.1103/PRXQuantum.5.030356\">10.1103/PRXQuantum.5.030356</a>","mla":"Zadnik, Lenart, et al. “Quantum Many-Body Spin Ratchets.” <i>PRX Quantum</i>, vol. 5, no. 3, 030356, American Physical Society, 2024, doi:<a href=\"https://doi.org/10.1103/PRXQuantum.5.030356\">10.1103/PRXQuantum.5.030356</a>.","apa":"Zadnik, L., Ljubotina, M., Krajnik, Ž., Ilievski, E., &#38; Prosen, T. (2024). Quantum many-body spin ratchets. <i>PRX Quantum</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PRXQuantum.5.030356\">https://doi.org/10.1103/PRXQuantum.5.030356</a>","ieee":"L. Zadnik, M. Ljubotina, Ž. Krajnik, E. Ilievski, and T. Prosen, “Quantum many-body spin ratchets,” <i>PRX Quantum</i>, vol. 5, no. 3. American Physical Society, 2024.","ista":"Zadnik L, Ljubotina M, Krajnik Ž, Ilievski E, Prosen T. 2024. Quantum many-body spin ratchets. PRX Quantum. 5(3), 030356.","chicago":"Zadnik, Lenart, Marko Ljubotina, Žiga Krajnik, Enej Ilievski, and Tomaž Prosen. “Quantum Many-Body Spin Ratchets.” <i>PRX Quantum</i>. American Physical Society, 2024. <a href=\"https://doi.org/10.1103/PRXQuantum.5.030356\">https://doi.org/10.1103/PRXQuantum.5.030356</a>.","short":"L. Zadnik, M. Ljubotina, Ž. Krajnik, E. Ilievski, T. Prosen, PRX Quantum 5 (2024)."},"year":"2024","author":[{"last_name":"Zadnik","first_name":"Lenart","full_name":"Zadnik, Lenart"},{"full_name":"Ljubotina, Marko","last_name":"Ljubotina","first_name":"Marko","orcid":"0000-0003-0038-7068","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E"},{"last_name":"Krajnik","first_name":"Žiga","full_name":"Krajnik, Žiga"},{"last_name":"Ilievski","first_name":"Enej","full_name":"Ilievski, Enej"},{"full_name":"Prosen, Tomaž","last_name":"Prosen","first_name":"Tomaž"}],"date_updated":"2025-09-08T09:55:09Z"},{"date_created":"2024-10-29T16:04:05Z","doi":"10.1103/prxquantum.5.040311","oa_version":"Published Version","article_processing_charge":"Yes","title":"Tangent space generators of matrix product states and exact floquet quantum scars","department":[{"_id":"MaSe"}],"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).","corr_author":"1","publication_identifier":{"eissn":["2691-3399"]},"external_id":{"arxiv":["2403.12325"],"isi":["001346198800001"]},"project":[{"call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E"}],"month":"10","file_date_updated":"2024-10-30T08:59:09Z","type":"journal_article","arxiv":1,"abstract":[{"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.","lang":"eng"}],"date_published":"2024-10-23T00:00:00Z","_id":"18488","isi":1,"intvolume":"         5","APC_amount":"3711,01 EUR","publication_status":"published","DOAJ_listed":"1","language":[{"iso":"eng"}],"issue":"4","volume":5,"OA_place":"publisher","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","day":"23","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"oa":1,"article_type":"original","quality_controlled":"1","date_updated":"2025-09-08T14:26:29Z","author":[{"full_name":"Ljubotina, Marko","last_name":"Ljubotina","first_name":"Marko","orcid":"0000-0003-0038-7068","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E"},{"last_name":"Petrova","first_name":"Elena","full_name":"Petrova, Elena","id":"0ac84990-897b-11ed-a09c-f5abb56a4ede"},{"first_name":"Norbert","last_name":"Schuch","full_name":"Schuch, Norbert"},{"last_name":"Serbyn","first_name":"Maksym","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"}],"year":"2024","OA_type":"gold","citation":{"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.","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>.","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>","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).","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."},"article_number":"040311","ddc":["530"],"status":"public","publication":"PRX Quantum","publisher":"American Physical Society","file":[{"checksum":"2e057ba021744d0a74602517935326b3","content_type":"application/pdf","file_size":1151431,"success":1,"date_created":"2024-10-30T08:59:09Z","date_updated":"2024-10-30T08:59:09Z","access_level":"open_access","file_id":"18489","relation":"main_file","file_name":"2024_PRXQuantum_Ljubotina.pdf","creator":"dernst"}],"has_accepted_license":"1","scopus_import":"1","ec_funded":1},{"publication_identifier":{"issn":["2160-3308"]},"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).","abstract":[{"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.","lang":"eng"}],"arxiv":1,"month":"08","type":"journal_article","file_date_updated":"2024-09-05T09:39:00Z","project":[{"call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E"}],"external_id":{"isi":["001299667100002"],"arxiv":["2311.08108"]},"title":"Many-body entropies and entanglement from polynomially many local measurements","article_processing_charge":"Yes","oa_version":"Published Version","doi":"10.1103/physrevx.14.031035","date_created":"2024-09-04T18:57:11Z","department":[{"_id":"MaSe"}],"DOAJ_listed":"1","publication_status":"published","APC_amount":"4863,6 EUR","intvolume":"        14","language":[{"iso":"eng"}],"date_published":"2024-08-26T00:00:00Z","isi":1,"_id":"17493","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"quality_controlled":"1","article_type":"original","oa":1,"volume":14,"issue":"3","day":"26","OA_place":"publisher","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","status":"public","publication":"Physical Review X","ddc":["530"],"article_number":"031035","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>","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.","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>.","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>.","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.","short":"B. Vermersch, M. Ljubotina, J.I. Cirac, P. Zoller, M. Serbyn, L. Piroli, Physical Review X 14 (2024)."},"OA_type":"gold","scopus_import":"1","ec_funded":1,"has_accepted_license":"1","file":[{"content_type":"application/pdf","file_size":1408836,"checksum":"1b114acc89025120727200681e4e9074","date_updated":"2024-09-05T09:39:00Z","access_level":"open_access","date_created":"2024-09-05T09:39:00Z","success":1,"creator":"cchlebak","file_name":"2024_PhysRevX_Vermersch.pdf","relation":"main_file","file_id":"17532"}],"publisher":"American Physical Society","date_updated":"2025-09-08T09:04:14Z","year":"2024","author":[{"first_name":"Benoît","last_name":"Vermersch","full_name":"Vermersch, Benoît"},{"last_name":"Ljubotina","first_name":"Marko","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","orcid":"0000-0003-0038-7068"},{"full_name":"Cirac, J. Ignacio","last_name":"Cirac","first_name":"J. Ignacio"},{"first_name":"Peter","last_name":"Zoller","full_name":"Zoller, Peter"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827","last_name":"Serbyn","first_name":"Maksym","full_name":"Serbyn, Maksym"},{"first_name":"Lorenzo","last_name":"Piroli","full_name":"Piroli, Lorenzo"}]},{"article_type":"original","quality_controlled":"1","oa":1,"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"day":"01","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","volume":108,"issue":"5","file":[{"relation":"main_file","file_id":"13981","creator":"dernst","file_name":"2023_PhysRevB_Brighi.pdf","content_type":"application/pdf","file_size":3051398,"checksum":"f763000339b5fd543c14377109920690","date_created":"2023-08-07T09:48:08Z","success":1,"date_updated":"2023-08-07T09:48:08Z","access_level":"open_access"}],"publisher":"American Physical Society","scopus_import":"1","ec_funded":1,"has_accepted_license":"1","publication":"Physical Review B","status":"public","ddc":["530"],"citation":{"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>","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>","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>.","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.","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>.","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)."},"article_number":"054201","author":[{"orcid":"0000-0002-7969-2729","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","first_name":"Pietro","last_name":"Brighi","full_name":"Brighi, Pietro"},{"orcid":"0000-0003-0038-7068","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","full_name":"Ljubotina, Marko","first_name":"Marko","last_name":"Ljubotina"},{"full_name":"Abanin, Dmitry A.","last_name":"Abanin","first_name":"Dmitry A."},{"orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","first_name":"Maksym","full_name":"Serbyn, Maksym"}],"year":"2023","date_updated":"2025-04-14T07:52:06Z","arxiv":1,"type":"journal_article","file_date_updated":"2023-08-07T09:48:08Z","month":"08","abstract":[{"lang":"eng","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."}],"external_id":{"arxiv":["2303.16876"]},"project":[{"call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E"}],"publication_identifier":{"eissn":["2469-9969"],"issn":["2469-9950"]},"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].","corr_author":"1","department":[{"_id":"MaSe"}],"title":"Many-body localization proximity effect in a two-species bosonic Hubbard model","doi":"10.1103/physrevb.108.054201","oa_version":"Published Version","date_created":"2023-08-05T18:25:22Z","article_processing_charge":"Yes (in subscription journal)","language":[{"iso":"eng"}],"intvolume":"       108","publication_status":"published","_id":"13963","date_published":"2023-08-01T00:00:00Z"},{"department":[{"_id":"MaSe"}],"title":"Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models","article_processing_charge":"No","oa_version":"Published Version","doi":"10.21468/scipostphys.15.3.093","date_created":"2023-09-14T13:08:23Z","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."}],"arxiv":1,"type":"journal_article","file_date_updated":"2023-09-20T10:46:10Z","month":"09","project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020"}],"external_id":{"arxiv":["2210.15607"]},"publication_identifier":{"issn":["2542-4653"]},"corr_author":"1","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).","_id":"14334","related_material":{"record":[{"status":"public","relation":"earlier_version","id":"12750"}]},"keyword":["General Physics and Astronomy"],"date_published":"2023-09-13T00:00:00Z","language":[{"iso":"eng"}],"publication_status":"published","intvolume":"        15","day":"13","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","volume":15,"issue":"3","quality_controlled":"1","article_type":"original","oa":1,"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"year":"2023","author":[{"last_name":"Brighi","first_name":"Pietro","full_name":"Brighi, Pietro","orcid":"0000-0002-7969-2729","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Ljubotina, Marko","last_name":"Ljubotina","first_name":"Marko","orcid":"0000-0003-0038-7068","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E"},{"full_name":"Serbyn, Maksym","first_name":"Maksym","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827"}],"date_updated":"2025-04-14T07:52:05Z","has_accepted_license":"1","scopus_import":"1","ec_funded":1,"file":[{"success":1,"date_created":"2023-09-20T10:46:10Z","date_updated":"2023-09-20T10:46:10Z","access_level":"open_access","checksum":"4cef6a8021f6b6c47ab2f2f2b1387ac2","file_size":4866506,"content_type":"application/pdf","relation":"main_file","file_id":"14350","creator":"dernst","file_name":"2023_SciPostPhysics_Brighi.pdf"}],"publisher":"SciPost Foundation","status":"public","publication":"SciPost Physics","ddc":["530"],"citation":{"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>.","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.","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>","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>","short":"P. Brighi, M. Ljubotina, M. Serbyn, SciPost Physics 15 (2023).","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>.","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."},"article_number":"093"},{"department":[{"_id":"MaSe"}],"oa_version":"Published Version","doi":"10.1103/PhysRevX.13.011033","date_created":"2023-04-16T22:01:09Z","article_processing_charge":"No","title":"Superdiffusive energy transport in kinetically constrained models","external_id":{"isi":["000957625700001"]},"project":[{"call_identifier":"H2020","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899"}],"type":"journal_article","file_date_updated":"2023-04-17T08:36:53Z","month":"03","abstract":[{"lang":"eng","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."}],"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].","corr_author":"1","publication_identifier":{"eissn":["2160-3308"]},"_id":"12839","isi":1,"date_published":"2023-03-07T00:00:00Z","language":[{"iso":"eng"}],"intvolume":"        13","publication_status":"published","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","day":"07","issue":"1","volume":13,"oa":1,"article_type":"original","quality_controlled":"1","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"author":[{"first_name":"Marko","last_name":"Ljubotina","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","orcid":"0000-0003-0038-7068"},{"full_name":"Desaules, Jean Yves","last_name":"Desaules","first_name":"Jean Yves"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827","full_name":"Serbyn, Maksym","first_name":"Maksym","last_name":"Serbyn"},{"first_name":"Zlatko","last_name":"Papić","full_name":"Papić, Zlatko"}],"year":"2023","date_updated":"2025-04-14T07:52:07Z","publisher":"American Physical Society","file":[{"access_level":"open_access","date_updated":"2023-04-17T08:36:53Z","date_created":"2023-04-17T08:36:53Z","success":1,"content_type":"application/pdf","checksum":"ee060cea609af79bba7af74b1ce28078","file_size":1958523,"file_name":"2023_PhysReviewX_Ljubotina.pdf","creator":"dernst","file_id":"12845","relation":"main_file"}],"scopus_import":"1","ec_funded":1,"has_accepted_license":"1","ddc":["530"],"article_number":"011033","citation":{"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>.","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>","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>","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.","short":"M. Ljubotina, J.Y. Desaules, M. Serbyn, Z. Papić, Physical Review X 13 (2023).","ista":"Ljubotina M, Desaules JY, Serbyn M, Papić Z. 2023. Superdiffusive energy transport in kinetically constrained models. Physical Review X. 13(1), 011033.","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>."},"publication":"Physical Review X","status":"public"},{"date_updated":"2025-04-14T07:52:06Z","author":[{"id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","orcid":"0000-0003-0038-7068","full_name":"Ljubotina, Marko","last_name":"Ljubotina","first_name":"Marko"},{"last_name":"Roy","first_name":"Dibyendu","full_name":"Roy, Dibyendu"},{"last_name":"Prosen","first_name":"Tomaž","full_name":"Prosen, Tomaž"}],"year":"2022","citation":{"ama":"Ljubotina M, Roy D, Prosen T. Absence of thermalization of free systems coupled to gapped interacting reservoirs. <i>Physical Review B</i>. 2022;106(5). doi:<a href=\"https://doi.org/10.1103/physrevb.106.054314\">10.1103/physrevb.106.054314</a>","ieee":"M. Ljubotina, D. Roy, and T. Prosen, “Absence of thermalization of free systems coupled to gapped interacting reservoirs,” <i>Physical Review B</i>, vol. 106, no. 5. American Physical Society, 2022.","apa":"Ljubotina, M., Roy, D., &#38; Prosen, T. (2022). Absence of thermalization of free systems coupled to gapped interacting reservoirs. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.106.054314\">https://doi.org/10.1103/physrevb.106.054314</a>","mla":"Ljubotina, Marko, et al. “Absence of Thermalization of Free Systems Coupled to Gapped Interacting Reservoirs.” <i>Physical Review B</i>, vol. 106, no. 5, 054314, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/physrevb.106.054314\">10.1103/physrevb.106.054314</a>.","ista":"Ljubotina M, Roy D, Prosen T. 2022. Absence of thermalization of free systems coupled to gapped interacting reservoirs. Physical Review B. 106(5), 054314.","chicago":"Ljubotina, Marko, Dibyendu Roy, and Tomaž Prosen. “Absence of Thermalization of Free Systems Coupled to Gapped Interacting Reservoirs.” <i>Physical Review B</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/physrevb.106.054314\">https://doi.org/10.1103/physrevb.106.054314</a>.","short":"M. Ljubotina, D. Roy, T. Prosen, Physical Review B 106 (2022)."},"article_number":"054314","publication":"Physical Review B","status":"public","publisher":"American Physical Society","scopus_import":"1","ec_funded":1,"issue":"5","volume":106,"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","day":"31","oa":1,"article_type":"original","quality_controlled":"1","date_published":"2022-08-31T00:00:00Z","isi":1,"_id":"12269","intvolume":"       106","publication_status":"published","language":[{"iso":"eng"}],"oa_version":"Preprint","date_created":"2023-01-16T10:00:39Z","doi":"10.1103/physrevb.106.054314","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2106.08373","open_access":"1"}],"article_processing_charge":"No","title":"Absence of thermalization of free systems coupled to gapped interacting reservoirs","department":[{"_id":"MaSe"}],"acknowledgement":"M.L. and T.P. acknowledge support from the European Research Council (ERC) through the advanced grant 694544 – OMNES and the grant P1-0402 of Slovenian Research Agency (ARRS). M.L. acknowledges support from the European Research Council (ERC) through the starting grant 850899 – NEQuM. D.R. acknowledges support from the Ministry of Electronics & Information Technology (MeitY), India under the grant for “Centre for Excellence in Quantum\r\nTechnologies” with Ref. No. 4(7)/2020-ITEA. ","publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"external_id":{"arxiv":["2106.08373"],"isi":["000861332900005"]},"project":[{"call_identifier":"H2020","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"month":"08","type":"journal_article","arxiv":1,"abstract":[{"lang":"eng","text":"We study the thermalization of a small XX chain coupled to long, gapped XXZ leads at either side by observing the relaxation dynamics of the whole system. Using extensive tensor network simulations, we show that such systems, although not integrable, appear to show either extremely slow thermalization or even lack thereof since the two cannot be distinguished within the accuracy of our numerics. We show that the persistent oscillations observed in the spin current in the middle of the XX chain are related to eigenstates of the entire system located within the gap of the boundary chains. We find from exact diagonalization that some of these states remain strictly localized within the XX chain and do not hybridize with the rest of the system. The frequencies of the persistent oscillations determined by numerical simulations of dynamics match the energy differences between these states exactly. This has important implications for open systems, where the strongly interacting leads are often assumed to thermalize the central system. Our results suggest that, if we employ gapped systems for the leads, this assumption does not hold."}]},{"article_number":"030343","ddc":["530"],"citation":{"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>","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>","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.","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.","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>.","short":"M. Ljubotina, B. Roos, D.A. Abanin, M. Serbyn, PRX Quantum 3 (2022)."},"publication":"PRX Quantum","status":"public","ec_funded":1,"has_accepted_license":"1","scopus_import":"1","file":[{"creator":"dernst","file_name":"2022_PRXQuantum_Ljubotina.pdf","relation":"main_file","file_id":"12457","content_type":"application/pdf","file_size":7661905,"checksum":"ef8f0a1b5a019b3958009162de0fa4c3","date_updated":"2023-01-30T11:02:50Z","access_level":"open_access","date_created":"2023-01-30T11:02:50Z","success":1}],"publisher":"American Physical Society","date_updated":"2025-04-14T07:52:07Z","year":"2022","author":[{"id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","orcid":"0000-0003-0038-7068","full_name":"Ljubotina, Marko","first_name":"Marko","last_name":"Ljubotina"},{"id":"5DA90512-D80F-11E9-8994-2E2EE6697425","orcid":"0000-0002-9071-5880","first_name":"Barbara","last_name":"Roos","full_name":"Roos, Barbara"},{"full_name":"Abanin, Dmitry A.","last_name":"Abanin","first_name":"Dmitry A."},{"full_name":"Serbyn, Maksym","first_name":"Maksym","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827"}],"tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"oa":1,"quality_controlled":"1","article_type":"original","issue":"3","volume":3,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","day":"23","publication_status":"published","intvolume":"         3","language":[{"iso":"eng"}],"date_published":"2022-09-23T00:00:00Z","keyword":["General Medicine"],"_id":"12276","corr_author":"1","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].","publication_identifier":{"eissn":["2691-3399"]},"project":[{"call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E"}],"external_id":{"arxiv":["2204.02899"]},"abstract":[{"lang":"eng","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."}],"file_date_updated":"2023-01-30T11:02:50Z","month":"09","type":"journal_article","arxiv":1,"article_processing_charge":"No","date_created":"2023-01-16T10:01:56Z","doi":"10.1103/prxquantum.3.030343","oa_version":"Published Version","title":"Optimal steering of matrix product states and quantum many-body scars","department":[{"_id":"MaSe"},{"_id":"RoSe"}]},{"_id":"12750","related_material":{"record":[{"status":"public","id":"14334","relation":"later_version"},{"id":"12732","relation":"dissertation_contains","status":"public"}]},"date_published":"2022-11-07T00:00:00Z","language":[{"iso":"eng"}],"publication_status":"draft","department":[{"_id":"GradSch"},{"_id":"MaSe"}],"license":"https://creativecommons.org/licenses/by-nc-sa/4.0/","oa_version":"Preprint","doi":"10.48550/arXiv.2210.15607","date_created":"2023-03-23T14:33:13Z","article_processing_charge":"No","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2210.15607"}],"title":"Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models","external_id":{"arxiv":["2210.15607"]},"type":"preprint","arxiv":1,"month":"11","abstract":[{"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 a 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 universality classes of dynamics and invite their further theoretical and experimental studies.","lang":"eng"}],"corr_author":"1","author":[{"first_name":"Pietro","last_name":"Brighi","full_name":"Brighi, Pietro","orcid":"0000-0002-7969-2729","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87"},{"orcid":"0000-0003-0038-7068","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","full_name":"Ljubotina, Marko","first_name":"Marko","last_name":"Ljubotina"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827","last_name":"Serbyn","first_name":"Maksym","full_name":"Serbyn, Maksym"}],"year":"2022","date_updated":"2026-04-07T13:26:31Z","article_number":"2210.15607","citation":{"ieee":"P. Brighi, M. Ljubotina, and M. Serbyn, “Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models,” <i>arXiv</i>. .","mla":"Brighi, Pietro, et al. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” <i>ArXiv</i>, 2210.15607, doi:<a href=\"https://doi.org/10.48550/arXiv.2210.15607\">10.48550/arXiv.2210.15607</a>.","ama":"Brighi P, Ljubotina M, Serbyn M. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. <i>arXiv</i>. doi:<a href=\"https://doi.org/10.48550/arXiv.2210.15607\">10.48550/arXiv.2210.15607</a>","apa":"Brighi, P., Ljubotina, M., &#38; Serbyn, M. (n.d.). Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. <i>arXiv</i>. <a href=\"https://doi.org/10.48550/arXiv.2210.15607\">https://doi.org/10.48550/arXiv.2210.15607</a>","short":"P. Brighi, M. Ljubotina, M. Serbyn, ArXiv (n.d.).","chicago":"Brighi, Pietro, Marko Ljubotina, and Maksym Serbyn. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” <i>ArXiv</i>, n.d. <a href=\"https://doi.org/10.48550/arXiv.2210.15607\">https://doi.org/10.48550/arXiv.2210.15607</a>.","ista":"Brighi P, Ljubotina M, Serbyn M. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. arXiv, 2210.15607."},"publication":"arXiv","status":"public","OA_place":"repository","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","day":"07","oa":1,"tmp":{"image":"/images/cc_by_nc_sa.png","short":"CC BY-NC-SA (4.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode","name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)"}}]