Qubit assisted enhancement of quantum correlations in an optomechanical system

被引：10

作者：

Chakraborty, Subhadeep ^{[1
]}

Sarma, Amarendra K. ^{[1
]}

机构：

[1] Indian Inst Technol Guwahati, Dept Phys, Gauhati 781039, Assam, India

来源：

ANNALS OF PHYSICS | 2018年 / 392卷

关键词：

Optomechanical system; Continuous-variable system; Entanglement; Logarithmic negativity; Quantum mutual information; Gaussian quantum discord; NANOMECHANICAL MOTION; STATE TRANSFER; OSCILLATOR; CRITERION; LIGHT;

D O I：

10.1016/j.aop.2018.03.007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We perform a theoretical study on quantum correlations in an optomechanical system where the mechanical mirror is perturbatively coupled to an auxiliary qubit. In our study, we consider logarithmic negativity to quantify the degree of stationary entanglement between the cavity field and mechanical mirror, and, Gaussian quantum discord as a witness of the quantumness of the correlation beyond entanglement. Utilizing experimentally feasible parameters, we show that both entanglement and quantum discord enhance significantly with increase in mirror-qubit coupling. Moreover, we find that in presence of the mirror-qubit coupling entanglement could be generated at a considerably lower optomechanical coupling strength, which is also extremely robust against the environmental temperature. Overall, our proposed scheme offers some considerable advantages for realizing the continuous variable quantum information and communication. (C) 2018 Elsevier Inc. All rights reserved.

引用

页码：39 / 48

页数：10

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