Phase estimation via delocalized photon subtraction operation inside the SU(1,1) interferometer
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866909643406573568 |
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| author | Li, Zhihao Kang, Qingqian Zhao, Teng Liu, Cunjin Hu, Liyun Deng, Chengzhi |
| author_facet | Li, Zhihao Kang, Qingqian Zhao, Teng Liu, Cunjin Hu, Liyun Deng, Chengzhi |
| contents | 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 Cramér-Rao bound, we find that the phase sensitivity of the D-PSO can get closer to the quantum Cramér-Rao bound and has the ability to resist internal loss. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_07684 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phase estimation via delocalized photon subtraction operation inside the SU(1,1) interferometer Li, Zhihao Kang, Qingqian Zhao, Teng Liu, Cunjin Hu, Liyun Deng, Chengzhi Quantum Physics 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 Cramér-Rao bound, we find that the phase sensitivity of the D-PSO can get closer to the quantum Cramér-Rao bound and has the ability to resist internal loss. |
| title | Phase estimation via delocalized photon subtraction operation inside the SU(1,1) interferometer |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.07684 |