Study of thermal decoherence of harmonic oscillators
谐振子系统的热力学退相干研究作者机构：College of ScienceXi’an University of Science and TechnologyXi’an 710054China
出 版 物：《原子与分子物理学报》 (Journal of Atomic and Molecular Physics)
年 卷 期：2025年第42卷第5期
页 面：108-114页
学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学]
主 题：Quantum decoherence Grand canonical ensemble Oscillators
摘 要：The thermal decoherence of harmonic oscillators is investigated *** quantum system presented here is a one-dimensional oscillator with angular frequency,which is surrounded by a thermal bath of environmental *** are various environmental oscillators with different angular frequency(below an ultraviolet cutoff).At the beginning,the quantum system is a pure state and the environmental oscillators are in thermodynamic equilibrium with *** a period,the system-environment interactions inspire significant decoherence of the quantum *** decoherence is displayed by explicit calculations of the purity and von Neumann entropy of the quantum *** is worth noting that the decoherence could be significant even in the weak coupling and low temperature case due to the large amount of environmental degrees of *** the decoherence process is inspired between the quantum system and an ordinary thermal environment here,the thermal decoherence result is quite general.
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