量子耗散系统中的相位扩散

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摘要翻译：
我们研究了与系统的约化密度矩阵相关的量子相位分布在许多实际重要的情况下的动力学，当系统在其环境的影响下演化，通过量子非破坏子类型的耦合相互作用，使得有退相干而无耗散，以及当它通过耗散相互作用相互作用，导致退相干和耗散时。系统被认为是一个二能级原子（或等效的自旋1/2系统）或一个谐振子，环境被建模为一个谐振子浴，从压缩热态开始。明确地指出了不同环境参数对系统在不同初始态下的量子相位分布动力学的影响。从我们的工作中发现的一个有趣的特征是，压缩效应和温度效应之间的关系取决于体系-浴相互作用的类型。在量子非破坏型相互作用的情况下，压缩和温度共同作用，对相分布产生扩散效应。相反，在耗散相互作用的情况下，温度的影响可以通过压缩来抵消，压缩表现为对相位随机化的抵制。我们利用相分布给出了原子系统中的互补概念。我们还利用特定初始态条件下的相位分布研究了相位的色散。
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英文标题：
《Phase Diffusion in Quantum Dissipative Systems》
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作者：
Subhashish Banerjee and R. Srikanth
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最新提交年份：
2007
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分类信息：

一级分类：Physics        物理学
二级分类：Quantum Physics        量子物理学
分类描述：Description coming soon
描述即将到来
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一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
  We study the dynamics of the quantum phase distribution associated with the reduced density matrix of a system for a number of situations of practical importance, as the system evolves under the influence of its environment, interacting via a quantum nondemoliton type of coupling, such that there is decoherence without dissipation, as well as when it interacts via a dissipative interaction, resulting in decoherence as well as dissipation. The system is taken to be either a two-level atom (or equivalently, a spin-1/2 system) or a harmonic oscillator, and the environment is modeled as a bath of harmonic oscillators, starting out in a squeezed thermal state. The impact of the different environmental parameters on the dynamics of the quantum phase distribution for the system starting out in various initial states, is explicitly brought out. An interesting feature that emerges from our work is that the relationship between squeezing and temperature effects depends on the type of system-bath interaction. In the case of quantum nondemolition type of interaction, squeezing and temperature work in tandem, producing a diffusive effect on the phase distribution. In contrast, in case of a dissipative interaction, the influence of temperature can be counteracted by squeezing, which manifests as a resistence to randomization of phase. We make use of the phase distributions to bring out a notion of complementarity in atomic systems. We also study the dispersion of the phase using the phase distributions conditioned on particular initial states of the system.
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PDF链接：
https://arxiv.org/pdf/706.3633

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关键词：distribution relationship interaction environment equilibrium phase squeezing 谐振子 influence 影响