Memory-assisted squeezed light velocimetry under realistic loss and incoherent noise
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866916052882948096 |
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| author | Gündoğan, Mustafa Ahmadi, Arash Krutzik, Markus |
| author_facet | Gündoğan, Mustafa Ahmadi, Arash Krutzik, Markus |
| contents | We propose a velocity sensor based on a two-memory Mach--Zehnder interferometer fed by a coherent probe and squeezed vacuum, read out by balanced homodyne detection. One memory is taken as a stationary reference, while the second memory moves during storage, so that its velocity is mapped onto a differential interferometric phase at readout. The two memories are otherwise assumed identical and are described by a Gaussian write--store--read lifetime together with the associated unconditional noise floor. Using the classical Fisher information, we derive the velocity sensitivity, the transmission threshold required for a target quantum gain, and the optimum storage time. The squeezed scheme improves on equal-resource coherent homodyne within an operating window set mainly by total transmission and phase stability. For representative near-term parameters, unconditional memory noise floors up to about $10^{-1}$ photons per trial do not by themselves remove the advantage; after optimization the improvement remains at the few-percent level and is limited chiefly by loss. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_27723 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Memory-assisted squeezed light velocimetry under realistic loss and incoherent noise Gündoğan, Mustafa Ahmadi, Arash Krutzik, Markus Quantum Physics Optics We propose a velocity sensor based on a two-memory Mach--Zehnder interferometer fed by a coherent probe and squeezed vacuum, read out by balanced homodyne detection. One memory is taken as a stationary reference, while the second memory moves during storage, so that its velocity is mapped onto a differential interferometric phase at readout. The two memories are otherwise assumed identical and are described by a Gaussian write--store--read lifetime together with the associated unconditional noise floor. Using the classical Fisher information, we derive the velocity sensitivity, the transmission threshold required for a target quantum gain, and the optimum storage time. The squeezed scheme improves on equal-resource coherent homodyne within an operating window set mainly by total transmission and phase stability. For representative near-term parameters, unconditional memory noise floors up to about $10^{-1}$ photons per trial do not by themselves remove the advantage; after optimization the improvement remains at the few-percent level and is limited chiefly by loss. |
| title | Memory-assisted squeezed light velocimetry under realistic loss and incoherent noise |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2605.27723 |