Enhanced standoff sensing resolution using quantum illumination

Saikat Guha, Jeffrey H. Shapiro

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Loss and noise quickly destroy quantum entanglement. Nevertheless, recent work has shown that a quadrature-entangled light source can reap a substantial performance advantage over all classical-state sources of the same average transmitter power in scenarios whose loss and noise makes them entanglement breaking [1, 2, 3, 4, 5, 6], standoff target-detection being an example. In this paper, we make a first step in extending this quantum illumination paradigm to the optical imaging domain, viz., to obtain better spatial resolution for standoff optical sensing. Our canonical imaging scenario - restricted, for simplicity, to one transverse dimension - is taken to be that of resolving one versus two closely-spaced in-phase specular point targets. We show that an entangled-state transmitter, which uses continuous-wave-pumped spontaneous parametric downconversion (SPDC), achieves an error-probability exponent that exceeds that of all classical-state transmitters of the same average power. Using these error-exponent results, we find the ultimate spatial-resolution limits for coherent-state and SPDC imaging systems that use their respective quantum-optimal receivers, thus quantifying the latter's spatial-resolution advantage over the former. We also propose a structured optical receiver that is ideally capable of harnessing 3 dB (of the full 6 dB) gain in the error-probability exponent achievable by the SPDC transmitter and its quantum-optimal receiver.

Original languageEnglish (US)
Title of host publicationQuantum Communication, Measurement and Computing, QCMC 2010 - The Tenth International Conference
Number of pages4
StatePublished - 2011
Event10th International Conference on Quantum Communication, Measurement And Computing, QCMC 2010 - Brisbane, QLD, Australia
Duration: Jul 19 2010Jul 23 2010

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference10th International Conference on Quantum Communication, Measurement And Computing, QCMC 2010
CityBrisbane, QLD


  • Entanglement
  • quantum imaging
  • spontaneous parametric downconversion

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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