Phase Sensitivity Improvement in Correlation-Enhanced Nonlinear Interferometers

摘要

Interferometers are widely used as sensors in precision measurement. Compared with a conventional Mach-Zehnder interferometer, the sensitivity of a correlation-enhanced nonlinear interferometer can break the standard quantum limit. Phase sensitivity plays a significant role in the enhanced performance. In this paper, we review improvement in phase estimation technologies in correlation-enhanced nonlinear interferometers, including SU(1,1) interferometer and SU(1,1)-SU(2) hybrid interferometer, and so on, and the applications in quantum metrology and quantum sensing networks.

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