Open AccessPhase estimation of an SU(1,1) interferometer with a coherent superposition squeezed vacuum in a realistic case
Author(s) -
Youke Xu,
Shoukang Chang,
Cunjin Liu,
Li-Yun Hu,
Sanqiu Liu
Publication year - 2022
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.472662
Subject(s) - superposition principle , physics , optics , interferometry , photon , coherent states , sensitivity (control systems) , squeezed coherent state , phase (matter) , subtraction , quantum optics , quantum mechanics , quantum , mathematics , electronic engineering , arithmetic , engineering
The phase sensitivity of SU(1,1) interferometer is investigated using a coherent state and an m-coherent superposition squeezed vacuum states as inputs and the intensity detection. Photon-subtraction, photon-addition and photon superposition are three special cases. Both ideal and realistic cases are considered. It is shown that the coefficient s of coherent superposition can modulate the performance of phase sensitivity, especially in a small squeezing region. Even in the presence of photon losses, the three-kind of non-Gaussian operations can achieve the improvement of measure precision, and the photon addition presents the best robustness compared to the photon subtraction and coherent superposition. For small squeezing, the first-order non-Gaussian operation may be the most preferred in improving phase sensitivity if considering the limitations of experimental conditions. Our results may be helpful for the practical application of quantum information.