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arXiv:1902.05587 · Physical Review A

Maximum advantage of quantum illumination

Shannon M. Ray, James Schneeloch, Christopher C. Tison, Paul M. Alsing

Published Jul 17, 2019• 10 citations
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Abstract

The discrimination of quantum states is at the heart of several quantum information protocols. Here, a specific quantum channel discrimination protocol, known as quantum illumination, is shown to be optimal when one uses a Bell state; the simplified theoretical tools used by the authors might find broader applicability.
DOI
10.1103/physreva.100.012327

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Quantum illumination is a binary hypothesis testing to detect a possible low-reflective object. Theoretically, both cat state illumination and Gaussian-state illumination possess the upper bound of 3dB sensitivity gain, over the usual coherent state illumination, for the significantly low illuminating intensity. Here, we investigate further how to enhance the quantum advantage of quantum illumination by optimizing the illuminating cat states for larger illuminating intensity. By comparing the quantum Fisher information or error exponent, we show that the sensitivity of the quantum illumination with generic cat states proposed here can be optimized further, and the 10.3% sensitive enhancement over the previous cat state illumination can be obtained.
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