Quantum-enhanced balanced detection for ultrasensitive transmission measurement

被引：19

作者：

Ozeki, Yasuyuki ^{[1
]}

Miyawaki, Yu ^{[1
]}

Taguchi, Yoshitaka ^{[1
]}

机构：

[1] Univ Tokyo, Dept Elect Engn & Informat Syst, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan

来源：

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 2020年 / 37卷 / 11期

基金：

日本学术振兴会;

关键词：

NOISE; SENSITIVITY; SPECTROSCOPY;

D O I：

10.1364/JOSAB.403222

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Balanced detection is a popular method to cancel out the effect of laser intensity noise in optical measurements and spectroscopy. However, the signal-to-noise ratio (SNR) that can be achieved with balanced detection is constrained by the standard quantum limit (SQL). Here, we propose quantum-enhanced balanced detection (QBD), which allows us to improve the SNR beyond the SQL to realize ultrasensitive transmission measurement. In QBD, squeezed vacuum is injected to one of the input ports of a beamsplitter (BS) used in balanced detection to produce a pair of light waves whose shot noises are entangled with each other. Compared with previous quantum-enhanced measurement methods, QBD is advantageous because it can handle a higher optical power without sacrificing the degree of sensitivity enhancement. We present the theory of QBD and discuss the effects of the splitting ratio of the BS and the optical loss caused by the sample under test. We also describe the application of QBD to the sensitivity enhancement of molecular vibrational imaging based on stimulated Raman scattering microscopy. (C) 2020 Optical Society of America

引用

页码：3288 / 3295

页数：8

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