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arXiv:2111.00793 · Nature Physics

Nonlinear interferometry beyond classical limit enabled by cyclic dynamics

Qi Liu, Ling-Na Wu, Jiahao Cao, Tian-Wei Mao, Xinwei Li, Shuai-Feng Guo, Meng Khoon Tey, Li You

Published Dec 20, 2021• 53 citations
arXivHTMLPDF
DOI
10.1038/s41567-021-01441-7

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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.