Quantum Illumination with Gaussian States
Si-Hui Tan,Baris I. Erkmen,Vittorio Giovannetti,Saikat Guha,Seth Lloyd,Lorenzo Maccone,Stefano Pirandola,Jeffrey H. Shapiro +7 more
TLDR
By making the optimum joint measurement on the light received from the target region together with the retained spontaneous parametric down-conversion idler beam, the quantum-illumination system realizes a 6 dB advantage in the error-probability exponent over the optimum reception coherent-state system.Abstract:
An optical transmitter irradiates a target region containing a bright thermal-noise bath in which a low-reflectivity object might be embedded. The light received from this region is used to decide whether the object is present or absent. The performance achieved using a coherent-state transmitter is compared with that of a quantum-illumination transmitter, i.e., one that employs the signal beam obtained from spontaneous parametric down-conversion. By making the optimum joint measurement on the light received from the target region together with the retained spontaneous parametric down-conversion idler beam, the quantum-illumination system realizes a 6 dB advantage in the error-probability exponent over the optimum reception coherent-state system. This advantage accrues despite there being no entanglement between the light collected from the target region and the retained idler beam.read more
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Strong Converse Exponents for a Quantum Channel Discrimination Problem and Quantum-Feedback-Assisted Communication
TL;DR: It is shown that the most general adaptive discrimination strategies provide no asymptotic advantage over non-adaptive tensor-power strategies in this channel discrimination setting, and a strong converse theorem is established for the quantum-feedback-assisted capacity of a channel.
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Quantum Sensing with Squeezed Light
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Computable bounds for the discrimination of Gaussian states
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TL;DR: By combining the Minkowski inequality and the quantum Chernoff bound, easy-to-compute upper bounds for the error probability affecting the optimal discrimination of Gaussian states are derived.
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Theory of channel simulation and bounds for private communication
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