Nonlinear and nonlinear-linear hybrid interferometers using coherent and squeezed vacuum states

Classical and quantum states working in concert play an essential role in high-precision interferometry. In this regard, coherent combined with squeezed vacuum states are the most promising candidate. Here we complement this subject by comparing nonlinear and nonlinear-linear hybrid interferometers...

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Bibliographic Details
Published inOptics express Vol. 32; no. 27; p. 49121
Main Authors Zhang, Jian-Dong, Jia, Fan, Hou, Lili, Wang, Shuai
Format Journal Article
LanguageEnglish
Published United States 30.12.2024
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Summary:Classical and quantum states working in concert play an essential role in high-precision interferometry. In this regard, coherent combined with squeezed vacuum states are the most promising candidate. Here we complement this subject by comparing nonlinear and nonlinear-linear hybrid interferometers with homodyne detection as a readout strategy. For a high-photon coherent state, either of the two interferometers can provide the phase sensitivity approaching the quantum Cramer-Rao bound. Additionally, we discuss the impacts of photon loss during the transmission and readout stages. We find that a nonlinear interferometer is advantageous over a nonlinear-linear hybrid interferometer. With increasing photon number of the coherent state, the maximal tolerable lossy rate ensuring phase sensitivity beyond the shot-noise limit is close to 50%. Our work may deepen the understanding of quantum-enhanced interferometry using nonlinear dynamics.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.544878