Phase sensitivity with a coherent beam and twin beams via intensity difference detection

刘俊 ¹邵涛 ¹李晨露 ¹张敏洋 ¹胡友友 ¹陈东旭 ²卫栋³

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作者信息

1. School of Science,Jiangsu University of Science and Technology,Zhenjiang 212003,China
2. Quantum Information Research Center,Shangrao Normal University,Shangrao 334001,China
3. School of Physics,Xi'an Jiaotong University,Xi'an 710049,China
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Abstract

We focus on the Mach-Zehnder interferometer(MZI)with the input of a coherent beam and one of the bright en-tangled twin beams with an external power reference beam employed for measurement.The results show that the phase sensitivity can reach sub-Heisenberg limit and approach quantum Cramér-Rao bound by changing the squeezing parame-ters and the photon number of the coherent beam,under the phase-matching condition.The absence of the external power reference beam will degrade the performance of the phase sensitivity.Meanwhile,this scheme shows good robustness against the losses of the photon detectors.We present a detailed discussion about the phase sensitivities when the inputs are two coherent beams,or a coherent beam plus a single-mode squeezed vacuum beam based on the MZI.This scenario can be applied in the field of phase precision measurements and other optical sensors.

Key words

Mach-Zehnder interferometer/phase sensitivity/quantum squeezing

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基金项目

National Natural Science Foundation of China(12104190)

National Natural Science Foundation of China(12104189)

National Natural Science Foundation of China(12204312)

Natural Science Foundation of Jiangsu Province(BK20210874)

Jiangsu Provincial Key Research and Development Program(BE2022143)

Jiangxi Provincial Natural science Foundation(20224BAB211014)

Jiangxi Provincial Natural science Foundation(20232BAB201042)

General Project of Natural Science Research in Colleges and Universities of Jiangsu Province(20KJB140008)

出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

参考文献量42

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