| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Phase sensitivity of a lossy truncated SU(1,1) interferometer with double-port homodyne detection |
| Yu-Wei Xiao(肖煜伟), Yue Ji(吉悦), Jia-Yi Wei(魏嘉怡), Jian-Dong Zhang(张建东), and Li-Li Hou(侯丽丽)† |
| School of Mathematics and Physics, Jiangsu University of Technology, Changzhou 213001, China |
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Abstract We theoretically investigate the phase sensitivity of a truncated SU(1,1) interferometer fed with a two-mode coherent state and employing double-port homodyne detection. On the one hand, we analytically demonstrate that the two-mode coherent state provides better phase sensitivity than the single-mode coherent state. In addition, we show that the double-port homodyne detection is a quasi-optimal measurement. For a bright coherent-state input, the sensitivity of this scheme saturates the phase-sensitivity bound determined by the quantum Fisher information. On the other hand, we quantitatively illustrate the advantage of double-port homodyne detection over the single-port scheme under ideal conditions and in the presence of photon loss, respectively. Furthermore, our analysis indicates that the scheme we propose is robust against photon loss.
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Received: 17 June 2025
Revised: 11 August 2025
Accepted manuscript online: 20 August 2025
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PACS:
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42.50.-p
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(Quantum optics)
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42.50.Dv
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(Quantum state engineering and measurements)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12104193 and U24A2017), National Undergraduate Training Program for Innovation and Entrepreneurship (Grant No. 202411463037Z), and the project of Changzhou Physics Society Fund (Grant No. CW20250102). |
Corresponding Authors:
Li-Li Hou
E-mail: hllslxy@jsut.edu.cn
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Cite this article:
Yu-Wei Xiao(肖煜伟), Yue Ji(吉悦), Jia-Yi Wei(魏嘉怡), Jian-Dong Zhang(张建东), and Li-Li Hou(侯丽丽) Phase sensitivity of a lossy truncated SU(1,1) interferometer with double-port homodyne detection 2026 Chin. Phys. B 35 014205
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