Unbalanced beam splitters enabling enhanced phase sensitivity of a Mach-Zehnder interferometer using coherent and squeezed vacuum states

Zhang, Jian-Dong; Wang, Shuai

doi:10.1103/physreva.107.043704

Cited by 7 publications

(1 citation statement)

References 26 publications

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“…The QFI is an effective tool in the estimation process when the inputs are the coherent state, Fock state, singlemode squeezed vacuum state, and single-mode squeezed coherent state, etc. [19][20][21][22][23][24][25][26][27][28] However, with an external phase reference beam in the detection process, the QFI can be different, which is observed by Jarzyna et al [19] In addition, Takeoka et al used a phase-averaging method to solve this problem. [23] Later, You et al claimed that the two-parameter phase estimation and the phase-averaging method is equivalent with specific inputs.…”

Section: Introductionmentioning

confidence: 99%

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

Liu 刘,

Shao 邵,

Li 李

et al. 2024

Chinese Phys. B

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We focus on the Mach-Zehnder interferometer (MZI) with the input of a coherent beam and one of the bright entangled 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 parameters 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.

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