Phase sensitivity of a lossy truncated SU(1,1) interferometer with double-port homodyne detection

doi:10.1088/1674-1056/adfd46

中国物理B ›› 2026, Vol. 35 ›› Issue (1): 14205-014205.doi: 10.1088/1674-1056/adfd46

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

收稿日期:2025-06-17 修回日期:2025-08-11 接受日期:2025-08-20 发布日期:2025-12-22
通讯作者: Li-Li Hou E-mail:hllslxy@jsut.edu.cn
基金资助:
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).

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

Received:2025-06-17 Revised:2025-08-11 Accepted:2025-08-20 Published:2025-12-22
Contact: Li-Li Hou E-mail:hllslxy@jsut.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: quantum-enhanced interferometer, parameter estimation, homodyne detection

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.

Key words: quantum-enhanced interferometer, parameter estimation, homodyne detection

中图分类号: (Quantum optics)

42.50.-p

42.50.Dv (Quantum state engineering and measurements)

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[J]. 中国物理B, 2026, 35(1): 14205-014205.

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Phase sensitivity of a lossy truncated SU(1,1) interferometer with double-port homodyne detection

Phase sensitivity of a lossy truncated SU(1,1) interferometer with double-port homodyne detection

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