Quantum receiver for phase-shift keying at the single-photon level

Jasminder S. Sidhu, Shuro Izumi, Jonas S. Neergaard-Nielsen, Cosmo Lupo, Ulrik L. Andersen

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
1 Downloads (Pure)


Quantum enhanced receivers are endowed with resources to achieve higher sensitivities than conventional technologies. For application in optical communications, they provide improved discriminatory capabilities for multiple nonorthogonal quantum states. In this work, we propose and experimentally demonstrate a new decoding scheme for quadrature phase-shift encoded signals. Our receiver surpasses the standard quantum limit and outperforms all previously known nonadaptive detectors at low input powers. Unlike existing approaches, the receiver only exploits linear optical elements and on-off photodetection. This circumvents the requirement for challenging feed-forward operations that limit communication transmission rates and can be readily implemented with current technology.
Original languageEnglish
Article number010332
Number of pages12
JournalPRX Quantum
Issue number1
Publication statusPublished - 26 Feb 2021


  • quantum communication
  • quantum mechanics
  • quantum information


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