噪声环境下纠缠相干态的量子关联特性

doi:10.3969/j.issn.1000-5641.2016.04.013

华东师范大学学报(自然科学版)

噪声环境下纠缠相干态的量子关联特性

杨志刚

华东师范大学精密光谱科学与技术国家重点实验室, 上海 200062

收稿日期:2015-06-24 出版日期:2016-07-25 发布日期:2016-09-29
通讯作者: 杨志刚, 男, 硕士研究生, 研究方向为量子关联. E-mail: 779052316@qq.com
基金资助:
国家自然科学基金(11174081, 11034002, 11134003, 11104075); 国家重点基础研究发展计划(2011CB921602, 2012CB821302)

The quantum correlation evolution properties of entangled coherent states in noisy environments

YANG Zhi-gang

State Key Laboratory of Precision Spectroscopy in Science and Technology, East China Normal University, Shanghai 200062, China

Received:2015-06-24 Online:2016-07-25 Published:2016-09-29

摘要/Abstract

摘要：

着重研究了在振幅噪声环境下两体纠缠相干态(Entangled Coherent State, ECS)与贝尔态的量子关联演化. 用形成纠缠熵(Entanglement of Formation, E)、量子失协(Quantum Discord, QD)、测量诱导扰动(Measurement-Induced Disturbance, MID)及几何量子失协(Geometric Measure of Quantum Discord, GQD)来计算纠缠相干态在噪声环境下的量子关联演化, 发现纠缠相干态的量子失协随着~$r$~先减小再增长, 然后又逐渐衰减至~0, 其测量诱导扰动则随着~$r$~单调衰减到0, 而量子失协以及测量诱导的扰动在振幅衰减影响下比形成纠缠熵演化更加持久. 通过对比分析, 发现对称与非对称噪声通道下贝尔(Bell)态不一定比纠缠相干态的纠缠度更高, 纠缠相干态以及贝尔态的量子关联影响区别不是很明显.

关键词: 纠缠相干态, 振幅衰减, 量子关联

Abstract:

In this paper, quantum correlation in an entangled coherent state (ECS) is extensively studied with four popular quantifiers, namely, entanglement of formation (E), quantum discord (QD), measurement-induced disturbance (MID) and geometric measure of quantum discord (GQD). Besides, the influence of amplitude damping noises on the quantum correlation is treated. It is found that, E decreases faster than QD.E (QD or MID) behaves quite similarly in an asymmetric and a symmetric noisy channel. What’s more, it is obvious that the Bell state is not always more entangled than the ECS.

Key words: entangled coherent state, amplitude damping channel, quantum correlation

杨志刚. 噪声环境下纠缠相干态的量子关联特性[J]. 华东师范大学学报(自然科学版), doi: 10.3969/j.issn.1000-5641.2016.04.013.

YANG Zhi-gang. The quantum correlation evolution properties of entangled coherent states in noisy environments[J]. Journal of East China Normal University(Natural Sc, doi: 10.3969/j.issn.1000-5641.2016.04.013.

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噪声环境下纠缠相干态的量子关联特性

The quantum correlation evolution properties of entangled coherent states in noisy environments

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