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

• URL: http://arxiv.org/abs/2009.03339v2
• Date: Sun, 31 Jan 2021 23:26:59 GMT
• Title: Quantum receiver for phase-shift keying at the single photon level
• Authors: Jasminder S. Sidhu, Shuro Izumi, Jonas S. Neergaard-Nielsen, Cosmo Lupo, Ulrik L. Andersen
• Abstract summary: 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.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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