Phase estimation via delocalized photon subtraction operation inside the SU(1,1) interferometer

• URL: http://arxiv.org/abs/2506.07684v1
• Date: Mon, 09 Jun 2025 12:13:51 GMT
• Title: Phase estimation via delocalized photon subtraction operation inside the SU(1,1) interferometer
• Authors: Zhihao Li, Qingqian Kang, Teng Zhao, Cunjin Liu, Liyun Hu, Chengzhi Deng,
• Abstract summary: We propose a theoretical scheme to improve the precision of phase measurement using intensity detection.<n>We compare the phase sensitivity and the quantum Fisher information between D-PSO and localized photon subtraction operation.<n>It has been found that the D-PSO can improve the measurement accuracy of the SU (1,1) interferometer and enhance its robustness against internal photon loss.
• Score: 5.415557213665936
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a theoretical scheme to improve the precision of phase measurement using intensity detection by implementing delocalized photon subtraction operation (D-PSO) inside the SU(1,1) interferometer, with the coherent state and the vacuum state as the input states. We compare the phase sensitivity and the quantum Fisher information between D-PSO and localized photon subtraction operation (L-PSO) under both ideal and photon-loss cases. It has been found that the D-PSO can improve the measurement accuracy of the SU(1,1) interferometer and enhance its robustness against internal photon loss. And it can cover and even exceed the advantages of the L-PSO on two modes, respectively. In addition, by comparing the standard quantum limit, the Heisenberg limit and quantum Cram\'er-Rao bound, we find that the phase sensitivity of the D-PSO can get closer to the quantum Cram\'er-Rao bound and has the ability to resist internal loss.

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