Quantum squeezing and sensing with pseudo anti-parity-time symmetry
- URL: http://arxiv.org/abs/2108.12873v2
- Date: Sat, 9 Apr 2022 05:11:47 GMT
- Title: Quantum squeezing and sensing with pseudo anti-parity-time symmetry
- Authors: Xi-Wang Luo, Chuanwei Zhang, Shengwang Du
- Abstract summary: We construct a quantum pseudo-anti-$mathcalPT$ symmetry in a two-mode bosonic system without involving Langevin noises.
We show that the spontaneous pseudo-$mathcalAPT$ symmetry breaking leads to an exceptional point.
Such dramatic changes of squeezing factors and quantum dynamics near the exceptional point are utilized for ultra-precision quantum sensing.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The emergence of parity-time ($\mathcal{PT}$) symmetry has greatly enriched
our study of symmetry-enabled non-Hermitian physics, but the realization of
quantum $\mathcal{PT}$-symmetry faces an intrinsic issue of unavoidable
symmetry-breaking Langevin noises. Here we construct a quantum
pseudo-anti-$\mathcal{PT}$ (pseudo-$\mathcal{APT}$) symmetry in a two-mode
bosonic system without involving Langevin noises. We show that the spontaneous
pseudo-$\mathcal{APT}$ 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-$\mathcal{APT}$ symmetric (broken)
region. Such dramatic changes of squeezing factors and quantum dynamics near
the exceptional point are utilized for ultra-precision 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. Our work offers a physical platform for
investigating exciting $\mathcal{APT}$ 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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