Reshaping nonclassical properties and metrological performance of entangled coherent states via post-selected von Neumann measurements
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913044239482880 |
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| author | Yuanbek, Janarbek Tenorio, Bruno Turek, Yusuf |
| author_facet | Yuanbek, Janarbek Tenorio, Bruno Turek, Yusuf |
| contents | In quantum metrology, measurements are usually treated as passive readout processes. Here we investigate whether post-selected von Neumann measurements (PVNMs) can be used as an active resource to reshape the nonclassical properties of a two-mode entangled coherent state (ECS). By analyzing the finite-coupling post-selected state, we show that PVNMs can enhance quadrature squeezing and sum squeezing, increase the Wigner-function negativity, and strengthen bipartite correlations, as witnessed by the Hillery-Zubairy criterion and linear entropy. We further evaluate the quantum Fisher information and the corresponding quantum Cramér-Rao bound for phase estimation, and discuss the trade-off between metrological gain and measurement-induced disturbance through the fidelity. Our scheme exhibits a phase-sensitivity advantage over standard ECS metrology for large average photon numbers. Our results suggest that PVNMs provide a tunable route for engineering nonclassical resources in continuous-variable sensing protocols. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_14079 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Reshaping nonclassical properties and metrological performance of entangled coherent states via post-selected von Neumann measurements Yuanbek, Janarbek Tenorio, Bruno Turek, Yusuf Quantum Physics In quantum metrology, measurements are usually treated as passive readout processes. Here we investigate whether post-selected von Neumann measurements (PVNMs) can be used as an active resource to reshape the nonclassical properties of a two-mode entangled coherent state (ECS). By analyzing the finite-coupling post-selected state, we show that PVNMs can enhance quadrature squeezing and sum squeezing, increase the Wigner-function negativity, and strengthen bipartite correlations, as witnessed by the Hillery-Zubairy criterion and linear entropy. We further evaluate the quantum Fisher information and the corresponding quantum Cramér-Rao bound for phase estimation, and discuss the trade-off between metrological gain and measurement-induced disturbance through the fidelity. Our scheme exhibits a phase-sensitivity advantage over standard ECS metrology for large average photon numbers. Our results suggest that PVNMs provide a tunable route for engineering nonclassical resources in continuous-variable sensing protocols. |
| title | Reshaping nonclassical properties and metrological performance of entangled coherent states via post-selected von Neumann measurements |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2511.14079 |