Absolute sensitivity of phase measurement in an SU(1,1) type interferometer

被引：33
作者：
Du, Wei [1 ]
Jia, Jun [1 ]
Chen, J. F. [1 ]
Ou, Z. Y. [5 ]
Zhang, Weiping [2 ,3 ,4 ]
机构：
[1] East China Normal Univ, Dept Phys, Quantum Inst Light & Atoms, Shanghai 200241, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Phys & Astron, Shanghai 200240, Peoples R China
[3] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China
[4] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China
[5] Indiana Univ Purdue Univ, Dept Phys, 402 North Blackford St, Indianapolis, IN 46202 USA
来源：
OPTICS LETTERS | 2018年 / 43卷 / 05期
基金：
中国国家自然科学基金;
关键词：
STANDARD QUANTUM LIMIT; NOISE;
D O I：
10.1364/OL.43.001051
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Absolute sensitivity is measured for the phase measurement in an SU(1,1) type interferometer, and the results are compared to that of a Mach-Zehnder interferometer operated under the condition of the same intra-interferometer intensity. The interferometer is phase locked to a point with the largest quantum noise cancellation, and a simulated phase modulation is added in one arm of the SU(1,1) interferometer. Both the signal and noise level are estimated at the same frequency range, and we obtained 3 dB improvement in sensitivity for the SU(1,1) interferometer over the Mach-Zehnder interferometer. Our results demonstrate a direct phase estimation and may pave the way for practical applications of a nonlinear interferometer. (C) 2018 Optical Society of America
引用
收藏
页码：1051 / 1054
页数：4
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