Quantum Estimation Methods for Quantum Illumination

M. Sanz, U. Las Heras, J.J. García-Ripoll, Enrique Solano, R. Di Candia

Research output: Contribution to journalArticleScientificpeer-review

86 Citations (Scopus)

Abstract

Quantum illumination consists in shining quantum light on a target region immersed in a bright thermal bath with the aim of detecting the presence of a possible low-reflective object. If the signal is entangled with the receiver, then a suitable choice of the measurement offers a gain with respect to the optimal classical protocol employing coherent states. Here, we tackle this detection problem by using quantum estimation techniques to measure the reflectivity parameter of the object, showing an enhancement in the signal-to-noise ratio up to 3 dB with respect to the classical case when implementing only local measurements. Our approach employs the quantum Fisher information to provide an upper bound for the error probability, supplies the concrete estimator saturating the bound, and extends the quantum illumination protocol to non-Gaussian states. As an example, we show how Schrödinger’s cat states may be used for quantum illumination.
Original languageEnglish
Number of pages5
JournalPhysical Review Letters
Volume118
Issue number7
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

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