中国物理B ›› 2024, Vol. 33 ›› Issue (1): 14203-14203.doi: 10.1088/1674-1056/ad0115

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Phase sensitivity with a coherent beam and twin beams via intensity difference detection

Jun Liu(刘俊)1,†, Tao Shao(邵涛)1, Chenlu Li(李晨露)1, Minyang Zhang(张敏洋)1, Youyou Hu(胡友友)1, Dongxu Chen(陈东旭)2,‡, and Dong Wei(卫栋)3   

  1. 1 School of Science, Jiangsu University of Science and Technology, Zhenjiang 212003, China;
    2 Quantum Information Research Center, Shangrao Normal University, Shangrao 334001, China;
    3 School of Physics, Xi'an Jiaotong University, Xi'an 710049, China
  • 收稿日期:2023-07-10 修回日期:2023-09-12 接受日期:2023-10-07 出版日期:2023-12-13 发布日期:2023-12-29
  • 通讯作者: Jun Liu, Dongxu Chen E-mail:junliu@just.edu.cn;chendx@sru.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12104190, 12104189, and 12204312), the Natural Science Foundation of Jiangsu Province (Grant No. BK20210874), the Jiangsu Provincial Key Research and Development Program (Grant No. BE2022143); the Jiangxi Provincial Natural Science Foundation (Grant Nos. 20224BAB211014 and 20232BAB201042), and the General Project of Natural Science Research in Colleges and Universities of Jiangsu Province (Grant No. 20KJB140008).

Phase sensitivity with a coherent beam and twin beams via intensity difference detection

Jun Liu(刘俊)1,†, Tao Shao(邵涛)1, Chenlu Li(李晨露)1, Minyang Zhang(张敏洋)1, Youyou Hu(胡友友)1, Dongxu Chen(陈东旭)2,‡, and Dong Wei(卫栋)3   

  1. 1 School of Science, Jiangsu University of Science and Technology, Zhenjiang 212003, China;
    2 Quantum Information Research Center, Shangrao Normal University, Shangrao 334001, China;
    3 School of Physics, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2023-07-10 Revised:2023-09-12 Accepted:2023-10-07 Online:2023-12-13 Published:2023-12-29
  • Contact: Jun Liu, Dongxu Chen E-mail:junliu@just.edu.cn;chendx@sru.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12104190, 12104189, and 12204312), the Natural Science Foundation of Jiangsu Province (Grant No. BK20210874), the Jiangsu Provincial Key Research and Development Program (Grant No. BE2022143); the Jiangxi Provincial Natural Science Foundation (Grant Nos. 20224BAB211014 and 20232BAB201042), and the General Project of Natural Science Research in Colleges and Universities of Jiangsu Province (Grant No. 20KJB140008).

摘要: We focus on the Mach—Zehnder interferometer (MZI) with the input of a coherent beam and one of the bright entangled twin beams with an external power reference beam employed for measurement. The results show that the phase sensitivity can reach sub-Heisenberg limit and approach quantum Cramér—Rao bound by changing the squeezing parameters and the photon number of the coherent beam, under the phase-matching condition. The absence of the external power reference beam will degrade the performance of the phase sensitivity. Meanwhile, this scheme shows good robustness against the losses of the photon detectors. We present a detailed discussion about the phase sensitivities when the inputs are two coherent beams, or a coherent beam plus a single-mode squeezed vacuum beam based on the MZI. This scenario can be applied in the field of phase precision measurements and other optical sensors.

关键词: Mach—Zehnder interferometer, phase sensitivity, quantum squeezing

Abstract: We focus on the Mach—Zehnder interferometer (MZI) with the input of a coherent beam and one of the bright entangled twin beams with an external power reference beam employed for measurement. The results show that the phase sensitivity can reach sub-Heisenberg limit and approach quantum Cramér—Rao bound by changing the squeezing parameters and the photon number of the coherent beam, under the phase-matching condition. The absence of the external power reference beam will degrade the performance of the phase sensitivity. Meanwhile, this scheme shows good robustness against the losses of the photon detectors. We present a detailed discussion about the phase sensitivities when the inputs are two coherent beams, or a coherent beam plus a single-mode squeezed vacuum beam based on the MZI. This scenario can be applied in the field of phase precision measurements and other optical sensors.

Key words: Mach—Zehnder interferometer, phase sensitivity, quantum squeezing

中图分类号:  (Quantum optics)

  • 42.50.-p
42.50.St (Nonclassical interferometry, subwavelength lithography) 03.65.Ta (Foundations of quantum mechanics; measurement theory)