| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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High-sensitivity phase estimation with a two-mode squeezed coherent state based on a Mach-Zehnder interferometer |
| Pengxiang Ruan(阮鹏祥)1, Jun Liu(刘俊)1,†, Chenlu Li(李晨露)1, Qingli Jing(荆庆丽)1, Mingming Zhang(张明明)1, and Dong-Xu Chen(陈东旭)2,‡ |
1 School of Science, Jiangsu University of Science and Technology, ZhenJiang 212003, China;
2 Quantum Information Research Center, Shangrao Normal University, Shangrao 334001, China |
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Abstract A scheme is proposed based on a Mach-Zehnder interferometer with high phase sensitivity, utilizing a two-mode squeezed coherent state, generated by four-wave mixing, as input. The phase sensitivity of this scheme easily surpasses the Heisenberg limit when intensity difference detection is applied. Under phase-matching conditions, the quantum Cramér-Rao bound significantly exceeds the Heisenberg limit. Additionally, the scheme exhibits robustness against photon loss. When compared with the modified SU(1,1) interferometer with two coherent state inputs, this approach demonstrates superior measurement sensitivity, evaluated through various detection methods and the quantum Cramér-Rao bound. This work holds potential applications in quantum metrology.
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Received: 21 May 2025
Revised: 18 July 2025
Accepted manuscript online: 28 July 2025
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PACS:
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42.50.-p
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(Quantum optics)
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03.65.Ta
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(Foundations of quantum mechanics; measurement theory)
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42.50.St
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(Nonclassical interferometry, subwavelength lithography)
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 12104190, 12104189, 12204312), the Natural Science Foundation of Jiangsu Province (Grant No. BK20210874), General project of Natural Science Research in Colleges And Universities of Jiangsu Province (Grant No. 20KJB140008), the Jiangxi Provincial Natural Science Foundation (Grant Nos. 20224BAB211014 and 20232BAB201042), and Key Laboratory of TianQin Project (Sun Yat-sen University). |
Corresponding Authors:
Jun Liu, Dong-Xu Chen
E-mail: junliu@just.edu.cn;chendx@sru.edu.cn
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Cite this article:
Pengxiang Ruan(阮鹏祥), Jun Liu(刘俊), Chenlu Li(李晨露), Qingli Jing(荆庆丽), Mingming Zhang(张明明), and Dong-Xu Chen(陈东旭) High-sensitivity phase estimation with a two-mode squeezed coherent state based on a Mach-Zehnder interferometer 2026 Chin. Phys. B 35 024203
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