| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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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 |
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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.
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Received: 23 January 2022
Revised: 16 March 2022
Accepted manuscript online: 06 April 2022
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PACS:
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42.50.-p
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(Quantum optics)
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42.50.Pq
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(Cavity quantum electrodynamics; micromasers)
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42.82.Fv
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(Hybrid systems)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12047520, 61941501, 61775062, 11574092, 61378012, 91121023, 62071186 and 61771205). |
Corresponding Authors:
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
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Cite this article:
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 2022 Chin. Phys. B 31 094203
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