QPSK Receiver outperforming the Standard Quantum Limit for any Signal Power

Christian R. Müller; Christian R. Müller; Gerd Leuchs; Gerd Leuchs; Christoph Marquardt; Christoph Marquardt

doi:10.1364/CLEO_QELS.2014.FM3A.6

CLEO: 2014
OSA Technical Digest (online) (Optica Publishing Group, 2014),
paper FM3A.6
•https://doi.org/10.1364/CLEO_QELS.2014.FM3A.6

QPSK Receiver outperforming the Standard Quantum Limit for any Signal Power

Christian R. Müller, Gerd Leuchs, and Christoph Marquardt

CLEO: QELS_Fundamental Science 2014

San Jose, California United States
8–13 June 2014
ISBN: 978-1-55752-999-2

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Quantum Detection (FM3A)

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C. R. Müller, G. Leuchs, and C. Marquardt, "QPSK Receiver outperforming the Standard Quantum Limit for any Signal Power," in CLEO: 2014, OSA Technical Digest (online) (Optica Publishing Group, 2014), paper FM3A.6.

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Abstract

We present a quantum receiver for the discrimination of quadrature phase-shift keyed signals that approaches the Helstrom bound for any signal power. The discrimination is performed via adaptive displacements prior to a single photon detector.

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