Quantum memory at an eigenstate phase transition in a weakly chaotic model

Lambert MR, Tsai SW, Kelly SP (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Physical Review A American Physical Society

Book Volume: 106

Article Number: 012206

Journal Issue: 1

DOI: 10.1103/PhysRevA.106.012206

Abstract

We study a fully connected quantum spin model resonantly coupled to a small environment of noninteracting spins, and investigate how initial state properties are remembered at long times. We find memory of initial state properties, in addition to the total energy, that are not conserved by the dynamics. This memory occurs in the middle of the spectrum where an eigenstate quantum phase transition (ESQPT) occurs as a function of energy. The memory effect at that energy in the spectrum is robust to system-environment coupling until the coupling changes the energy of the ESQPT. This work demonstrates the effect of ESQPT memory as independent of integrability and suggests a wider generality of this mechanism for preventing thermalization at ESQPTs.

Additional Organisation(s)

Sonderforschungsbereich/Transregio 306/1: Quantenkooperativität von Licht und Materie - QuCoLiMa

Related research project(s)

Synchronizing quantum spins with long-range dissipation (D04) TRR 306: Quantenkooperativität von Licht und Materie – QuCoLiMa Jan. 1, 2021 - Dec. 31, 2024

Involved external institutions

Los Alamos National Laboratory US United States (USA) (US) Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) University of California, Riverside (UCR) US United States (USA) (US)

How to cite

APA:

Lambert, M.R., Tsai, S.-W., & Kelly, S.P. (2022). Quantum memory at an eigenstate phase transition in a weakly chaotic model. Physical Review A, 106(1). https://dx.doi.org/10.1103/PhysRevA.106.012206

MLA:

Lambert, M. R., Shan-Wen Tsai, and Shane P. Kelly. "Quantum memory at an eigenstate phase transition in a weakly chaotic model." Physical Review A 106.1 (2022).

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