Toward Heisenberg-Limited Interferometry with Dual Squeezers
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arXiv
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866911638294102016 |
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| author | Gu, Yi Wang, Song-Ping Zhong, Wei |
| author_facet | Gu, Yi Wang, Song-Ping Zhong, Wei |
| contents | The canonical Mach-Zehnder interferometer fed with a coherent state and a squeezed-vacuum state of equal intensities is theoretically predicted to achieve Heisenberg scaling in phase sensitivity. However, this ultimate performance is unattainable using direct photon-number-difference detection due to a divergence arising precisely at the optimal equal-intensity regime. In this work, we introduce a dual-squeezing approach that overcomes this fundamental limitation. Our scheme employs an additional single-mode squeezer before detection, forming a paired configuration with the input squeezer used to generate the squeezed-vacuum state. We analytically demonstrate that the resulting dual-squeezing Mach-Zehnder interferometer enables Heisenberg-limited phase sensitivity with di rect photon-number-difference detection, while remaining robust against detection noise. Our work provides a feasible and robust route toward quantum-limited interferometric phase measurements |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_00331 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Toward Heisenberg-Limited Interferometry with Dual Squeezers Gu, Yi Wang, Song-Ping Zhong, Wei Quantum Physics The canonical Mach-Zehnder interferometer fed with a coherent state and a squeezed-vacuum state of equal intensities is theoretically predicted to achieve Heisenberg scaling in phase sensitivity. However, this ultimate performance is unattainable using direct photon-number-difference detection due to a divergence arising precisely at the optimal equal-intensity regime. In this work, we introduce a dual-squeezing approach that overcomes this fundamental limitation. Our scheme employs an additional single-mode squeezer before detection, forming a paired configuration with the input squeezer used to generate the squeezed-vacuum state. We analytically demonstrate that the resulting dual-squeezing Mach-Zehnder interferometer enables Heisenberg-limited phase sensitivity with di rect photon-number-difference detection, while remaining robust against detection noise. Our work provides a feasible and robust route toward quantum-limited interferometric phase measurements |
| title | Toward Heisenberg-Limited Interferometry with Dual Squeezers |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2605.00331 |