具有反射边界的时空中做圆周加速运动原子的量子相干性。

Quantum coherence of a circularly accelerated atom in a spacetime with a reflecting boundary.

作者信息

Zhang Wanhe, Liu Xiaobao, Yang Tingli

机构信息

Department of Innovation and Entrepreneurship, Liupanshui Normal University, Liupanshui, 553004, Guizhou, China.

Department of Physics and Electrical Engineering, Liupanshui Normal University, Liupanshui, 553004, Guizhou, China.

出版信息

Sci Rep. 2022 Jul 22;12(1):12577. doi: 10.1038/s41598-022-16647-9.

DOI:10.1038/s41598-022-16647-9

PMID:35869248

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9307635/

Abstract

We investigate, in the paradigm of open quantum systems, the dynamics of quantum coherence of a circularly accelerated atom coupled to a bath of vacuum fluctuating massless scalar field in a spacetime with a reflecting boundary. The master equation that governs the system evolution is derived. Our results show that in the case without a boundary, the vacuum fluctuations and centripetal acceleration will always cause the quantum coherence to decrease. However, with the presence of a boundary, the quantum fluctuations of the scalar field are modified, which makes that quantum coherence could be enhanced as compared to that in the case without a boundary. Particularly, when the atom is very close to the boundary, although the atom still interacts with the environment, it behaves as if it were a closed system and quantum coherence can be shielded from the effect of the vacuum fluctuating scalar field.

摘要

我们在开放量子系统的范式下，研究了在具有反射边界的时空中，与无质量标量场的真空涨落浴耦合的圆周加速原子的量子相干动力学。推导了描述系统演化的主方程。我们的结果表明，在没有边界的情况下，真空涨落和向心加速度总是会导致量子相干性降低。然而，在有边界的情况下，标量场的量子涨落会被修改，这使得与没有边界的情况相比，量子相干性可以得到增强。特别地，当原子非常靠近边界时，尽管原子仍与环境相互作用，但它的行为就好像是一个封闭系统，量子相干性可以免受真空涨落标量场的影响。