Enhanced phase estimation with coherently boosted two-mode squeezed beams and its application to optical gyroscopes

Xiao-Qi Xiao, Elisha S. Matekole, Jiankang Zhao, Guihua Zeng, Jonathan P. Dowling, and Hwang Lee

Phys. Rev. A 102, 022614 – Published 19 August 2020

Abstract

Quantum techniques, developed in recent decades, provide new approaches to achieving high-precision measurements beyond the classical bounds. In this paper, we theoretically demonstrate a metrology method for improving the sensitivity of the interferometric optical gyroscope, robust against the loss, by using coherent-light stimulated two-mode squeezed beams as the light source. The detection protocol is based on a simple intensity measurement, and the quantum noise is far below the shot-noise limit. The enhancement factors for different coherent light fields are analyzed in detail. Additionally, the influence of loss during the propagation in the optical path is studied, and the conditions for achieving sub-shot-noise measurement sensitivity are obtained. We also find that the phase sensitivity of the proposed gyroscope scheme becomes closer to the quantum Cramér-Rao bound with increasing of the photon number of the coherent beams.

Received 15 April 2020
Revised 18 June 2020
Accepted 14 July 2020

DOI:https://doi.org/10.1103/PhysRevA.102.022614

Physics Subject Headings (PhySH)

Quantum metrology

Quantum Information, Science & Technology

Authors & Affiliations

Xiao-Qi Xiao ^1,2,*, Elisha S. Matekole², Jiankang Zhao³, Guihua Zeng³, Jonathan P. Dowling^2,4,5,6,†, and Hwang Lee²

¹Department of Communication Engineering, Shanghai Dianji University, Shanghai 200240, China
²Hearne Institute for Theoretical Physics and Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
³State Key Laboratory of Advanced Optical Communication Systems and Networks, Institute of Sensing and Navigation, Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai 200030, China
⁴National Institute of Information and Communications Technology, Tokyo 184-8795, Japan
⁵NYU-ECNU Institute of Physics at NYU Shanghai, Shanghai 200062, China
⁶CAS-Alibaba Quantum Computing Laboratory, USTC, Shanghai 201315, China

^*xiaoxq@sdju.edu.cn
^†Deceased.

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Vol. 102, Iss. 2 — August 2020

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