Phase estimation of phase shifts in two arms for an SU(1,1) interferometer with coherent and squeezed vacuum states

doi:10.1088/1674-1056/26/9/094205

Abstract We theoretically study the quantum Fisher information (QFI) of the SU(1,1) interferometer with phase shifts in two arms by coherent ⊗ squeezed vacuum state input, and give the comparison with the result of phase shift only in one arm. Different from the traditional Mach-Zehnder interferometer, the QFI of single-arm case for an SU(1,1) interferometer can be slightly higher or lower than that of two-arm case, which depends on the intensities of the two arms of the interferometer. For coherent ⊗ squeezed vacuum state input with a fixed mean photon number, the optimal sensitivity is achieved with a squeezed vacuum input in one mode and the vacuum input in the other.

Keywords: phase estimation quantum Fisher information SU(1,1) interferometer

Received: 10 March 2017
Revised: 09 May 2017
Accepted manuscript online:

PACS:	42.50.St	(Nonclassical interferometry, subwavelength lithography)
	42.50.Lc	(Quantum fluctuations, quantum noise, and quantum jumps)
	07.60.Ly	(Interferometers)
	42.65.Yj	(Optical parametric oscillators and amplifiers)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11474095, 11654005, and 11234003) and the National Key Research and Development Program of China (Grant No. 2016YFA0302000).

Corresponding Authors: Chun-Hua Yuan
E-mail: chyuan@phy.ecnu.edu.cn

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Qian-Kun Gong(龚乾坤), Dong Li(李栋), Chun-Hua Yuan(袁春华), Ze-Yu Qu(区泽宇), Wei-Ping Zhang(张卫平) Phase estimation of phase shifts in two arms for an SU(1,1) interferometer with coherent and squeezed vacuum states 2017 Chin. Phys. B 26 094205

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Phase estimation of phase shifts in two arms for an SU(1,1) interferometer with coherent and squeezed vacuum states

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