Nonreciprocal coupling induced entanglement enhancement in a double-cavity optomechanical system

doi:10.1088/1674-1056/ac6499

中国物理B ›› 2022, Vol. 31 ›› Issue (9): 94203-094203.doi: 10.1088/1674-1056/ac6499

Nonreciprocal coupling induced entanglement enhancement in a double-cavity optomechanical system

Yuan-Yuan Liu(刘元元)¹, Zhi-Ming Zhang(张智明)², Jun-Hao Liu(刘军浩)^1,†, Jin-Dong Wang(王金东)^2,‡, and Ya-Fei Yu(於亚飞)^1,§

1 Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices(School of Information and Optoelectronic Science and Engineering), South China Normal University, Guangzhou 510006, China;
2 Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China

收稿日期:2022-01-23 修回日期:2022-03-16 接受日期:2022-04-06 出版日期:2022-08-19 发布日期:2022-09-03
通讯作者: Jun-Hao Liu, Jin-Dong Wang, Ya-Fei Yu E-mail:jhliu@m.scnu.edu.cn;wangjindong@m.scnu.edu.cn;yuyafei@m.scnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12047520, 61941501, 61775062, 11574092, 61378012, 91121023, 62071186 and 61771205).

Nonreciprocal coupling induced entanglement enhancement in a double-cavity optomechanical system

Yuan-Yuan Liu(刘元元)¹, Zhi-Ming Zhang(张智明)², Jun-Hao Liu(刘军浩)^1,†, Jin-Dong Wang(王金东)^2,‡, and Ya-Fei Yu(於亚飞)^1,§

1 Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices(School of Information and Optoelectronic Science and Engineering), South China Normal University, Guangzhou 510006, China;
2 Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China

Received:2022-01-23 Revised:2022-03-16 Accepted:2022-04-06 Online:2022-08-19 Published:2022-09-03
Contact: Jun-Hao Liu, Jin-Dong Wang, Ya-Fei Yu E-mail:jhliu@m.scnu.edu.cn;wangjindong@m.scnu.edu.cn;yuyafei@m.scnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12047520, 61941501, 61775062, 11574092, 61378012, 91121023, 62071186 and 61771205).

摘要/Abstract

摘要： We investigate the quantum entanglement in a double-cavity optomechanical system consisting of an optomechanical cavity and an auxiliary cavity, where the optomechanical cavity mode couples with the mechanical mode via radiation-pressure interaction, and simultaneously couples with the auxiliary cavity mode via nonreciprocal coupling. We study the entanglement between the mechanical oscillator and the cavity modes when the two cavities are reciprocally or nonreciprocally coupled. The logarithmic negativity $E_{n}^{(1)}$ ($E_{n}^{(2)}$) is adopted to describe the entanglement degree between the mechanical mode and the optomechanical cavity mode (the auxiliary cavity mode). We find that both $E_{n}^{(1)}$ and $E_{n}^{(2)}$ have maximum values in the case of reciprocal coupling. By using nonreciprocal coupling, $E_{n}^{(1)}$ and $E_{n}^{(2)}$ can exceed those maximum values, and a wider detuning region where the entanglement exists can be obtained. Moreover, the entanglement robustness with respect to the environment temperature is also effectively enhanced.

关键词: quantum entanglement, double-cavity optomechanical system, nonreciprocal coupling

Abstract: We investigate the quantum entanglement in a double-cavity optomechanical system consisting of an optomechanical cavity and an auxiliary cavity, where the optomechanical cavity mode couples with the mechanical mode via radiation-pressure interaction, and simultaneously couples with the auxiliary cavity mode via nonreciprocal coupling. We study the entanglement between the mechanical oscillator and the cavity modes when the two cavities are reciprocally or nonreciprocally coupled. The logarithmic negativity $E_{n}^{(1)}$ ($E_{n}^{(2)}$) is adopted to describe the entanglement degree between the mechanical mode and the optomechanical cavity mode (the auxiliary cavity mode). We find that both $E_{n}^{(1)}$ and $E_{n}^{(2)}$ have maximum values in the case of reciprocal coupling. By using nonreciprocal coupling, $E_{n}^{(1)}$ and $E_{n}^{(2)}$ can exceed those maximum values, and a wider detuning region where the entanglement exists can be obtained. Moreover, the entanglement robustness with respect to the environment temperature is also effectively enhanced.

Key words: quantum entanglement, double-cavity optomechanical system, nonreciprocal coupling

中图分类号: (Quantum optics)

42.50.-p

42.50.Pq (Cavity quantum electrodynamics; micromasers) 42.82.Fv (Hybrid systems)

Yuan-Yuan Liu(刘元元), Zhi-Ming Zhang(张智明), Jun-Hao Liu(刘军浩), Jin-Dong Wang(王金东), and Ya-Fei Yu(於亚飞). Nonreciprocal coupling induced entanglement enhancement in a double-cavity optomechanical system[J]. 中国物理B, 2022, 31(9): 94203-094203.

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Nonreciprocal coupling induced entanglement enhancement in a double-cavity optomechanical system

Nonreciprocal coupling induced entanglement enhancement in a double-cavity optomechanical system

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