Experimental Quantum Target Detection Approaching the Fundamental Helstrom Limit

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

10 Scopus Citations
View graph of relations

Author(s)

  • Feixiang Xu
  • Liang Xu
  • Tao Jiang
  • Man-Hong Yung
  • Lijian Zhang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number040504
Journal / PublicationPhysical Review Letters
Volume127
Issue number4
Online published22 Jul 2021
Publication statusPublished - 23 Jul 2021

Abstract

Quantum target detection is an emerging application that utilizes entanglement to enhance the sensing of the presence of an object. Although several experimental demonstrations for certain situations have been reported recently, the single-shot detection limit imposed by the Helstrom limit has not been reached because of the unknown optimum measurements. Here we report an experimental demonstration of quantum target detection, also known as quantum illumination, in the single-photon limit. In our experiment, one photon of the maximally entangled photon pair is employed as the probe signal and the corresponding optimum measurement is implemented at the receiver. We explore the detection problem in different regions of the parameter space and verify that the quantum advantage exists even in a forbidden region of the conventional illumination, where all classical schemes become useless. Our results indicate that quantum illumination breaks the classical limit for up to 40%, while approaching the quantum limit imposed by the Helstrom limit. These results not only demonstrate the advantage of quantum illumination, but also manifest its valuable potential of target detection.

Citation Format(s)

Experimental Quantum Target Detection Approaching the Fundamental Helstrom Limit. / Xu, Feixiang; Zhang, Xiao-Ming; Xu, Liang et al.
In: Physical Review Letters, Vol. 127, No. 4, 040504, 23.07.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review