Quantum Squeezing and Sensing with Pseudo-Anti-Parity-Time Symmetry

Luo, Xi-Wang; Zhang, Chuanwei; Du, Shengwang

doi:10.1103/physrevlett.128.173602

Title: Quantum Squeezing and Sensing with Pseudo-Anti-Parity-Time Symmetry

Journal Article · Fri Apr 29 00:00:00 EDT 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.128.173602· OSTI ID:1865672

Luo, Xi-Wang ^[1];

^[1];

^[1]

Univ. of Texas at Dallas, Richardson, TX (United States)

The emergence of parity-time (PT) symmetry has greatly enriched our study of symmetry-enabled non-Hermitian physics, but the realization of quantum PT symmetry faces an intrinsic issue of unavoidable symmetry-breaking Langevin noises. Here we construct a quantum pseudo-anti-PT (pseudo-APT) symmetry in a two-mode bosonic system without involving Langevin noises. We show that the spontaneous pseudo-APT symmetry breaking leads to an exceptional point, across which there is a transition between different types of quantum squeezing dynamics; i.e., the squeezing factor increases exponentially (oscillates periodically) with time in the pseudo-APT-symmetric (broken) region. Such dramatic changes of squeezing factors and quantum dynamics near the exceptional point are utilized for ultraprecision quantum sensing. These exotic quantum phenomena and sensing applications can be experimentally observed in two physical systems: spontaneous wave mixing nonlinear optics and atomic Bose-Einstein condensates. Furthermore, our Letter offers a physical platform for investigating exciting APT symmetry physics in the quantum realm, paving the way for exploring fundamental quantum non-Hermitian effects and their quantum technological applications.

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Research Organization:: Univ. of Texas at Dallas, Richardson, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); National Science Foundation (NSF)

Grant/Contract Number:: SC0022069; PHY-2110212

OSTI ID:: 1865672

Journal Information:: Physical Review Letters, Vol. 128, Issue 17; Related Information: Supplemental Material:https://journals.aps.org/prl/supplemental/10.1103/PhysRevLett.128.173602/SuppMatt-03-17.pdf; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Quantum Squeezing and Sensing with Pseudo-Anti-Parity-Time Symmetry

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