Using random coherent states to mimic quantum illumination

• URL: http://arxiv.org/abs/2311.02016v1
• Date: Fri, 3 Nov 2023 16:22:17 GMT
• Title: Using random coherent states to mimic quantum illumination
• Authors: Thomas Brougham, Nigam Samantaray and John Jeffers
• Abstract summary: Quantum illumination uses quantum correlations to enhance the detection of an object in the presence of background noise. We present a protocol that mimics the behaviour of quantum illumination, but does not use correlated or entangled modes.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum illumination uses quantum correlations to enhance the detection of an object in the presence of background noise. This advantage has been shown to exist even if one uses non-optimal direct measurements on the two correlated modes. Here we present a protocol that mimics the behaviour of quantum illumination, but does not use correlated or entangled modes. Instead, the protocol uses coherent (or phase-randomized coherent) pulses with randomly chosen intensities. The intensities are drawn from a distribution such that the average state looks thermal. Under appropriate conditions, the mimic protocol can perform similarly to quantum illumination schemes that use direct measurements. This holds even for a reflectance as low as $10^{-7}$. We also present an analytic condition which allows one to determine the sets of parameters in which each protocol works best.

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