Phase sensitivity via photon-subtraction operations inside Mach-Zehnder 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_ | 1866913825547091968 |
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| author | Zhou, Qisi Kang, Qinqian Jiang, Tao Zhao, Zekun Zhao, Teng Liu, Cunjin Hu, Liyun |
| author_facet | Zhou, Qisi Kang, Qinqian Jiang, Tao Zhao, Zekun Zhao, Teng Liu, Cunjin Hu, Liyun |
| contents | Based on the conventional Mach-Zehnder interferometer, we propose a metrological scheme to improve phase sensitivity. In this scheme, we use a coherent state and a squeezed vacuum state as input states, employ multi-photon-subtraction operations and make intensity-detection or homodyne-detection. We study phase sensitivity, quantum Fisher information and quantum Cramér-Rao bound under both ideal and lossy conditions. The results indicate that choosing an appropriate detection method and photon subtraction scheme can significantly enhance the phase sensitivity and robustness against photon losses. Even under lossy conditions, the multi-photon subtraction schemes can surpass the standard quantum limit. Notably, the homodyne detection method can even break through the Heisenberg limit. Moreover, increasing the number of photon-subtracted can enhance both phase sensitivity and quantum Fisher information. This research highlights the significant value of this scheme in quantum precision measurement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_04499 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phase sensitivity via photon-subtraction operations inside Mach-Zehnder interferometer Zhou, Qisi Kang, Qinqian Jiang, Tao Zhao, Zekun Zhao, Teng Liu, Cunjin Hu, Liyun Quantum Physics Based on the conventional Mach-Zehnder interferometer, we propose a metrological scheme to improve phase sensitivity. In this scheme, we use a coherent state and a squeezed vacuum state as input states, employ multi-photon-subtraction operations and make intensity-detection or homodyne-detection. We study phase sensitivity, quantum Fisher information and quantum Cramér-Rao bound under both ideal and lossy conditions. The results indicate that choosing an appropriate detection method and photon subtraction scheme can significantly enhance the phase sensitivity and robustness against photon losses. Even under lossy conditions, the multi-photon subtraction schemes can surpass the standard quantum limit. Notably, the homodyne detection method can even break through the Heisenberg limit. Moreover, increasing the number of photon-subtracted can enhance both phase sensitivity and quantum Fisher information. This research highlights the significant value of this scheme in quantum precision measurement. |
| title | Phase sensitivity via photon-subtraction operations inside Mach-Zehnder interferometer |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2505.04499 |