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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.19093 |
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| _version_ | 1866917400880873472 |
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| author | Bai, Enhao Wu, Tianyi Zhang, Huankai Peng, Jian Dong, Chen Sun, Fengkai Tong, Laiyuan Zhang, Zhenrong Zhou, Chun Li, Yaping |
| author_facet | Bai, Enhao Wu, Tianyi Zhang, Huankai Peng, Jian Dong, Chen Sun, Fengkai Tong, Laiyuan Zhang, Zhenrong Zhou, Chun Li, Yaping |
| contents | We analyze mismatch in the inverse-squeezing Kennedy receiver for binary displaced squeezed vacuum state discrimination. Mismatch is shown to be equivalent to a residual squeezing after nulling, which modifies the output photon-number statistics and makes the optimal maximum-a-posteriori (MAP) rule generally non-single-threshold. We find that the receiver is much more sensitive to phase mismatch than to amplitude mismatch. Under amplitude-only mismatch, the saturation error with finite-resolution photon-number-resolving detection exhibits a parity-step scaling, decreasing only when the detector resolution crosses even-photon thresholds. These results clarify the physical origin of mismatch-induced degradation and identify phase locking as the key requirement for practical implementations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_19093 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Mismatch in the Inverse-Squeezing Kennedy Receiver for Binary Displaced Squeezed-State Discrimination Bai, Enhao Wu, Tianyi Zhang, Huankai Peng, Jian Dong, Chen Sun, Fengkai Tong, Laiyuan Zhang, Zhenrong Zhou, Chun Li, Yaping Quantum Physics We analyze mismatch in the inverse-squeezing Kennedy receiver for binary displaced squeezed vacuum state discrimination. Mismatch is shown to be equivalent to a residual squeezing after nulling, which modifies the output photon-number statistics and makes the optimal maximum-a-posteriori (MAP) rule generally non-single-threshold. We find that the receiver is much more sensitive to phase mismatch than to amplitude mismatch. Under amplitude-only mismatch, the saturation error with finite-resolution photon-number-resolving detection exhibits a parity-step scaling, decreasing only when the detector resolution crosses even-photon thresholds. These results clarify the physical origin of mismatch-induced degradation and identify phase locking as the key requirement for practical implementations. |
| title | Mismatch in the Inverse-Squeezing Kennedy Receiver for Binary Displaced Squeezed-State Discrimination |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2601.19093 |