Quantum interferometer combining squeezing and parametric amplification

• URL: http://arxiv.org/abs/2005.01911v1
• Date: Tue, 5 May 2020 01:52:42 GMT
• Title: Quantum interferometer combining squeezing and parametric amplification
• Authors: Xiaojie Zuo, Zhihui Yan, Yanni Feng, Jingxu Ma, Xiaojun Jia, Changde Xie, and Kunchi Peng
• Abstract summary: The sensitivity improvement of $4.86pm 0.24$ dB beyond the standard quantum limit is deterministically realized. This interferometric system has significantly potential applications in a variety of measurements for tiny variances of physical quantities.
• Score: 1.099380072835174
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: High precision interferometers are the building blocks of precision metrology and the ultimate interferometric sensitivity is limited by the quantum noise. Here we propose and experimentally demonstrate a compact quantum interferometer involving two optical parametric amplifiers and the squeezed states generated within the interferometer are directly used for the phase-sensing quantum state. By both squeezing shot noise and amplifying phase-sensing intensity the sensitivity improvement of $4.86\pm 0.24$ dB beyond the standard quantum limit is deterministically realized and a minimum detectable phase smaller than that of all present interferometers under the same phase-sensing intensity is achieved. This interferometric system has significantly potential applications in a variety of measurements for tiny variances of physical quantities.

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