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Entanglement enhancement in a modulated optomechanical system via squeezed vacuum field |
| Huan-Huan Cheng(程欢欢), Chen-Rui Yang(杨晨锐), Gao-Feng Jiao(焦高锋), Cheng-Hua Bai(白成华), and Shao-Xiong Wu(武少雄)† |
| School of Semiconductor and Physics, North University of China, Taiyuan 030051, China |
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Abstract We present a double-cavity optomechanical system with a mechanical oscillator, which is jointly driven by an amplitude-modulated laser field and a weak squeezed vacuum field, aiming to explore quantum entanglement effects under the unresolved-sideband regime. Within our proposed scheme, it is possible not only to surpass the limit of maximum steady-state entanglement ln2 for bipartite entanglement, achieving strong entanglement, but also to significantly enhance tripartite entanglement and improve the system's robustness against thermal noise. Meanwhile, the introduction of the squeezed vacuum field plays a crucial role in entanglement control, enabling not only a several-fold enhancement of entanglement but also continuous and precise manipulation of its strength within specific ranges. The suggested method demonstrates exceptional flexibility and adaptability under a wide range of operating conditions, offering a new pathway for theoretical and experimental investigations of strong bipartite entanglement and tripartite entanglement.
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Received: 27 October 2025
Revised: 11 December 2025
Accepted manuscript online: 16 December 2025
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PACS:
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03.65.Ud
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(Entanglement and quantum nonlocality)
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03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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42.50.-p
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(Quantum optics)
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 12204440 and 12404418), the China Postdoctoral Science Foundation (Grant No. 2025M773357), and the Fundamental Research Program of Shanxi Province, China (Grant No. 202303021212171). |
Corresponding Authors:
Shao-Xiong Wu
E-mail: sxwu@nuc.edu.cn
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Cite this article:
Huan-Huan Cheng(程欢欢), Chen-Rui Yang(杨晨锐), Gao-Feng Jiao(焦高锋), Cheng-Hua Bai(白成华), and Shao-Xiong Wu(武少雄) Entanglement enhancement in a modulated optomechanical system via squeezed vacuum field 2026 Chin. Phys. B 35 040311
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