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

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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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 non-orthogonal 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 non-adaptive detectors at low input powers. Unlike existing approaches, the receiver only exploits linear optical elements and on-off photo-detection. 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
JournalPRX Quantum
Issue number1
Number of pages12
Publication statusPublished - 2021


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