Journal of East China Normal University(Natural Science) >

2024 , Vol. 2024 >Issue 3: 91 - 100

DOI: https://doi.org/10.3969/j.issn.1000-5641.2024.03.010

Atomic，Molecular, and Optical Physics

Research on the overestimation of sensitivity in lossy SU(2) and SU(1,1) interferometers

  • Jie ZENG ,
  • Chunhua YUAN
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  • School of Physics and Electronic Science, East China Normal University, Shanghai　200241, China

Received date: 2023-05-11

  Online published: 2024-05-25

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Abstract

In this study, based on the lossy SU(2) and SU(1,1) interferometer models, phase estimation in interferometers was investigated. The general expression for the overestimated quantum Fisher information (QFI), which exists when performing single-parameter phase estimation compared to two-parameter phase estimation, was theoretically studied. In addition, the variation in the overestimated QFI with the loss factor or beam splitting ratio was numerically analyzed with the input of coherent and squeezed vacuum states, and the disappearance and recovery of the overestimated QFI was related to the beam splitting ratio, gain factor, and squeeze amplitude. By adjusting the beam splitting ratio and loss factor, the best sensitivity was obtained, which is beneficial for quantum precision measurements in lossy environments.

Key words： multiparameter estimation; lossy interferometer model; quantum Fisher information matrix

Cite this article

Jie ZENG , Chunhua YUAN . Research on the overestimation of sensitivity in lossy SU(2) and SU(1,1) interferometers[J]. Journal of East China Normal University(Natural Science), 2024 , 2024(3) : 91 -100 . DOI: 10.3969/j.issn.1000-5641.2024.03.010

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