Quantum limits of covert target detection
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866912021566455808 |
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| author | Tham, Guo Yao Nair, Ranjith Gu, Mile |
| author_facet | Tham, Guo Yao Nair, Ranjith Gu, Mile |
| contents | In covert target detection, Alice attempts to send optical or microwave probes to determine the presence or absence of a weakly-reflecting target embedded in thermal background radiation within a target region, while striving to remain undetected by an adversary, Willie, who is co-located with the target and collects all light that does not return to Alice. We formulate this problem in a realistic setting and derive quantum-mechanical limits on Alice's error probability performance in entanglement-assisted target detection for any fixed level of her detectability by Willie. We demonstrate how Alice can approach this performance limit using two-mode squeezed vacuum probes in the regime of small to moderate background brightness, and how such protocols can outperform any conventional approach using Gaussian-distributed coherent states. In addition, we derive a universal performance bound for non-adversarial quantum illumination without requiring the passive-signature assumption. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_11013 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Quantum limits of covert target detection Tham, Guo Yao Nair, Ranjith Gu, Mile Quantum Physics Optics In covert target detection, Alice attempts to send optical or microwave probes to determine the presence or absence of a weakly-reflecting target embedded in thermal background radiation within a target region, while striving to remain undetected by an adversary, Willie, who is co-located with the target and collects all light that does not return to Alice. We formulate this problem in a realistic setting and derive quantum-mechanical limits on Alice's error probability performance in entanglement-assisted target detection for any fixed level of her detectability by Willie. We demonstrate how Alice can approach this performance limit using two-mode squeezed vacuum probes in the regime of small to moderate background brightness, and how such protocols can outperform any conventional approach using Gaussian-distributed coherent states. In addition, we derive a universal performance bound for non-adversarial quantum illumination without requiring the passive-signature assumption. |
| title | Quantum limits of covert target detection |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2310.11013 |