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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Quantum enhanced joint measurement of two conjugate observables with an SU(1, 1) interferometer

Yuhong Liu, Jiamin Li, Nan Huo, Xiaoying Li, Z. Y. Ou

Published Jul 1, 2017• 0 citations
Publisher

Abstract

We jointly measure the phase and amplitude modulation of an optical field with the newly developed SU(1,1) interferometer. We simultaneously achieve a signal-to-noise ratio improvement of 1.1 and 1 dB over the standard quantum limit in amplitude and phase measurement.
DOI
10.1109/cleopr.2017.8118844

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With the help of quantum entanglement, quantum dense metrology (QDM) is a technique that can make joint estimates of two conjugate quantities such as phase and amplitude modulations of an optical field, with an accuracy beating the standard quantum limit simultaneously. SU(1,1) interferometers (SUIs) can realize QDM with detection loss tolerance but is limited in absolute sensitivity. Here, we present a QDM scheme with a linear or SU(2) interferometer nested inside an SUI. By using a degenerate SUI and controlling the phase angle of the phase-sensitive amplifiers in the SUI, we can achieve the optimum quantum enhancement in the measurement precision of an arbitrary mixture of phase and amplitude modulation.
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