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Unquenched—a memoir on non-equilibrium dynamics of quantum many-body systems: honoring Amit Dutta

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Abstract

This short review explores the physics journey of Professor Amit Dutta, illuminating his collaborative contributions with students and peers. We mainly focus on standard approaches to understanding non-equilibrium quantum dynamics and ground-state criticality using quantum informatic measures like ground-state fidelity, the Loschmidt echo and/or the decoherence factor. Using Floquet theory as a tool, we also discuss the dynamics of hard-core bosonic chain, shedding light on the phenomenon of dynamical localization and different analytically approachable limits of Floquet theory. The review further extends to probe the physics of topological phase transitions in driven/quenched systems, where we mainly focus on the non-equilibrium response of topological systems and topological state preparation. Finally, we also discuss late-time quantum dynamics leading to the thermalization of open and closed systems, where we review contemporary approaches to the applicability of thermodynamic principles in microscopic quantum systems and the macroscopic emergence of statistical mechanics in driven/quenched ergodic systems. Throughout this memoir, Professor Amit Dutta’s important scientific contributions are mentioned for their impact on advancing our understanding of quantum dynamics and statistical mechanics.

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Acknowledgements

We acknowledge everyone with whom Professor Amit Dutta has actively collaborated with in his scientific journey. Particularly, we thank Bikas K. Chakraborty, Jayanta K Bhattacharjee, Peter Fulde, Roderich Moessner, Diptiman Sen, Anatoli Polkovnikov, Krishnendu Sengupta, Amit Agarwal, Adhip Agarwalla, Rajiv R. P. Singh, Sayak Dasgupta, Manisha Thakurathi, Sei Suzuki, Debanjan Chowdhury, Uma Divakaran, Victor Mukherjee, Sthitadhi Roy, Aavishkar A Patel, Guiseppe E. Santoro, Parongama Sen, Angelo Russomanno, Gabriel Aeppli, Lars Fritz, Ayoti Patra, Sougato Mardanya, R. Loganayagam, Rashi Sachdeva and Anirban Dutta. We also thank and acknowledge countless students with whom he has interacted in his lifetime. The work of Shraddha Sharma is supported by the Department of Science and Technology, Government of India under grant registration no.: IFA23-PH303 (INSPIRE Faculty Award). Souvik Bandyopadhyay acknowledges AFOSR, USA and Boston university for support. ICFO group acknowledges support from: ERC AdG NOQIA; MCIN/AEI (PGC2018\(-\)0910.13039/501100011033, CEX2019-000910- S/10.13039/501100011033, Plan National FIDEUA PID2019-106901GB-I00, Plan National STAMEENA PID2022-139099NB-I00 project funded by MCIN/AEI/10.13039/501100011033 and by the “European Union NextGenerationEU/PRTR” (PRTR-C17.I1), FPI); QUANTERA MAQS PCI2019-111828-2); QUANTERA DYNAMITE PCI2022-132919 (QuantERA II Programme co-funded by European Union’s Horizon 2020 program under Grant Agreement No 101017733), Ministry of Economic Affairs and Digital Transformation of the Spanish Government through the QUANTUM ENIA project call - Quantum Spain project, and by the European Union through the Recovery, Transformation, and Resilience Plan - NextGenerationEU within the framework of the Digital Spain 2026 Agenda; Fundació Cellex; Fundació Mir-Puig; Generalitat de Catalunya (European Social Fund FEDER and CERCA program, AGAUR Grant No. 2021 SGR 01452, QuantumCAT U16-011424, co-funded by ERDF Operational Program of Catalonia 2014-2020); Barcelona Supercomputing Center MareNostrum (FI-2023-1-0013); EU Quantum Flagship (PASQuanS2.1, 101113690); EU Horizon 2020 FET-OPEN OPTOlogic (Grant No 899794); EU Horizon Europe Program (Grant Agreement 101080086 - NeQST), ICFO Internal “QuantumGaudi” project; European Union’s Horizon 2020 program under the Marie Sklodowska-Curie grant agreement No 847648; “La Caixa” Junior Leaders fellowships, La Caixa” Foundation (ID 100010434): CF/BQ/PR23/11980043. Views and opinions expressed are, however, those of the author(s) only and do not necessarily reflect those of the European Union, European Commission, European Climate, Infrastructure and Environment Executive Agency (CINEA), or any other granting authority. Neither the European Union nor any granting authority can be held responsible for them. U.B. is also grateful for the financial support of the IBM Quantum Researcher Program.

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Authors and Affiliations

  1. Department of Physics and Astronomy, National Institute of Technology Rourkela, Rourkela, 769008, India

    Shraddha Sharma

  2. Department of Physics, BITS Pilani-Hyderabad Campus, Secunderabad, Telangana, 500078, India

    Tanay Nag

  3. Department of Physics, Indian Institute of Technology, Hyderabad, 502284, India

    Atanu Rajak

  4. Department of Physics, Boston University, Boston, MA, 02215, USA

    Souvik Bandyopadhyay

  5. ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860, Castelldefels, Barcelona, Spain

    Sourav Bhattacharjee & Utso Bhattacharya

  6. Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team, RIKEN Cluster for Pioneering Research (CPR), 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan

    Somnath Maity

  7. Institute for Theoretical Physics, ETH Zurich, 8093, Zurich, Switzerland

    Utso Bhattacharya

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Sharma, S., Nag, T., Rajak, A. et al. Unquenched—a memoir on non-equilibrium dynamics of quantum many-body systems: honoring Amit Dutta. Eur. Phys. J. B 97, 102 (2024). https://doi.org/10.1140/epjb/s10051-024-00740-1

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