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Quantum Illumination with Gaussian States

Research output: Contribution to journalLetter

Author(s)

  • Si-Hui Tan
  • Baris I. Erkmen
  • Vittorio Giovannetti
  • Saikat Guha
  • Seth Lloyd
  • Lorenzo Maccone
  • Stefano Pirandola
  • Jeffrey H. Shapiro

Department/unit(s)

Publication details

JournalPhysical Review Letters
DatePublished - 18 Dec 2008
Issue number25
Volume101
Number of pages4
Pages (from-to)253601
Original languageEnglish

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.

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