Two-parameter estimation via photon subtraction operation within a feedback-assisted interferometer
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866916781898072064 |
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| author | Kang, Qingqian Zhao, Zekun Zhou, Qisi Zhao, Teng Liu, Cunjin Su, Xin Hu, Liyun Liu, Sanqiu |
| author_facet | Kang, Qingqian Zhao, Zekun Zhou, Qisi Zhao, Teng Liu, Cunjin Su, Xin Hu, Liyun Liu, Sanqiu |
| contents | In this paper, we analyze how multi-photon subtraction operations in a feedback-assisted interferometer can enhance measurement precision for single-parameter and two-parameter estimation under both ideal and photon-loss conditions. We examine the effects of the feedback strength R, the optical parametric amplifier's gain g, the coherent state amplitude α, and the order of multi-photon subtraction on system performance. We demonstrate that an optimal feedback strength R_{opt} exists in both conditions. Selecting a suitable R can significantly boost the system's robustness to photon loss, and markedly improve measurement precision. And the photon subtraction operations within a feedback-assisted interferometer can further enhance measurement precision effectively. Additionally, we find that increasing intramode correlations while decreasing intermode correlations can improve estimation accuracy. This work investigates a new method through the synergistic integration of feedback topology and non-Gaussian operations into a multiparameter estimation system, along with their systematic study under both ideal and loss conditions. The findings may contribute to improving quantum-enhanced measurements and hold promise for high-precision quantum sensing research. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_05756 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-parameter estimation via photon subtraction operation within a feedback-assisted interferometer Kang, Qingqian Zhao, Zekun Zhou, Qisi Zhao, Teng Liu, Cunjin Su, Xin Hu, Liyun Liu, Sanqiu Quantum Physics In this paper, we analyze how multi-photon subtraction operations in a feedback-assisted interferometer can enhance measurement precision for single-parameter and two-parameter estimation under both ideal and photon-loss conditions. We examine the effects of the feedback strength R, the optical parametric amplifier's gain g, the coherent state amplitude α, and the order of multi-photon subtraction on system performance. We demonstrate that an optimal feedback strength R_{opt} exists in both conditions. Selecting a suitable R can significantly boost the system's robustness to photon loss, and markedly improve measurement precision. And the photon subtraction operations within a feedback-assisted interferometer can further enhance measurement precision effectively. Additionally, we find that increasing intramode correlations while decreasing intermode correlations can improve estimation accuracy. This work investigates a new method through the synergistic integration of feedback topology and non-Gaussian operations into a multiparameter estimation system, along with their systematic study under both ideal and loss conditions. The findings may contribute to improving quantum-enhanced measurements and hold promise for high-precision quantum sensing research. |
| title | Two-parameter estimation via photon subtraction operation within a feedback-assisted interferometer |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.05756 |