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

Qian Kun Gong; Dong Li; Chun Hua Yuan; Ze Yu Qu; Wei Ping Zhang

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

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

Qian Kun Gong, Dong Li, Chun Hua Yuan, Ze Yu Qu, Wei Ping Zhang

School of Physics and Electronic Science

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

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 MachZehnder 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.

Original language	English
Article number	094205
Journal	Chinese Physics B
Volume	26
Issue number	9
DOIs	https://doi.org/10.1088/1674-1056/26/9/094205
State	Published - Aug 2017

Keywords

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

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10.1088/1674-1056/26/9/094205

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

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 MachZehnder 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 = "SU(1,1) interferometer, phase estimation, quantum Fisher information",

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AU - Gong, Qian Kun

AU - Li, Dong

AU - Yuan, Chun Hua

AU - Qu, Ze Yu

AU - Zhang, Wei Ping

PY - 2017/8

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N2 - 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 MachZehnder 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.

AB - 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 MachZehnder 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.

KW - SU(1,1) interferometer

KW - phase estimation

KW - quantum Fisher information

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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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