Quantum interferometry via a coherent state mixed with a squeezed number state

doi:10.1088/1674-1056/28/4/044203

中国物理B ›› 2019, Vol. 28 ›› Issue (4): 44203-044203.doi: 10.1088/1674-1056/28/4/044203

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Quantum interferometry via a coherent state mixed with a squeezed number state

Li-Li Hou(侯丽丽), Yong-Xing Sui(眭永兴), Shuai Wang(王帅), Xue-Fen Xu(许雪芬)

1 School of Mathematics and Physics, Jiangsu University of Technology, Changzhou 213001, China;
2 Department of Fundamental Courses, Wuxi Institute of Technology, Wuxi 214121, China

收稿日期:2018-12-13 修回日期:2019-01-15 出版日期:2019-04-05 发布日期:2019-04-05
通讯作者: Shuai Wang, Xue-Fen Xu E-mail:ruifeng.wshslxy@jsut.edu.cn;xuxf@wxit.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11404040) and the Qing Lan Project of the Higher Educations of Jiangsu Province of China.

Quantum interferometry via a coherent state mixed with a squeezed number state

Li-Li Hou(侯丽丽)¹, Yong-Xing Sui(眭永兴)¹, Shuai Wang(王帅)¹, Xue-Fen Xu(许雪芬)²

1 School of Mathematics and Physics, Jiangsu University of Technology, Changzhou 213001, China;
2 Department of Fundamental Courses, Wuxi Institute of Technology, Wuxi 214121, China

Received:2018-12-13 Revised:2019-01-15 Online:2019-04-05 Published:2019-04-05
Contact: Shuai Wang, Xue-Fen Xu E-mail:ruifeng.wshslxy@jsut.edu.cn;xuxf@wxit.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11404040) and the Qing Lan Project of the Higher Educations of Jiangsu Province of China.

摘要/Abstract

摘要：

We theoretically investigate the phase sensitivity with parity measurement on a Mach-Zehnder interferometer with a coherent state combined with a squeezed number state. Within a constraint on the total mean photon number, we find, via parity measurement, that the mixing of a coherent state and squeezed number state can give better phase sensitivity than mixing a coherent state and squeezed vacuum state when the phase shift deviates from the optimal phase φ=0. In addition, we show that the classical Fisher information for parity measurement saturates the quantum Fisher information when the phase shift approaches to zero. Thus, the quantum Cramér-Rao bound can be reached via the parity measurement in the case of φ=0.

关键词: quantum optics, phase sensitivity, quantum metrology

Abstract:

Key words: quantum optics, phase sensitivity, quantum metrology

中图分类号: (Quantum state engineering and measurements)

42.50.Dv

03.65.Ta (Foundations of quantum mechanics; measurement theory)

侯丽丽, 眭永兴, 王帅, 许雪芬. Quantum interferometry via a coherent state mixed with a squeezed number state[J]. 中国物理B, 2019, 28(4): 44203-044203.

Li-Li Hou(侯丽丽), Yong-Xing Sui(眭永兴), Shuai Wang(王帅), Xue-Fen Xu(许雪芬). Quantum interferometry via a coherent state mixed with a squeezed number state[J]. Chin. Phys. B, 2019, 28(4): 44203-044203.

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Quantum interferometry via a coherent state mixed with a squeezed number state

Quantum interferometry via a coherent state mixed with a squeezed number state

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