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Quadrature phase shift keying coherent state discrimination via a hybrid receiver

C R Müller, Mario A. Usuga, Christoffer Wittmann +4 more

We propose and experimentally demonstrate a near-optimal discrimination scheme for the quadrature phase shift keying (QPSK) protocol. We show in theory that the performance of our hybrid scheme is superior to the standard scheme—heterodyne detection—for all signal amplitudes and underpin the predictions with our experimental results. Furthermore, our scheme provides hitherto the best performance in the domain of highly attenuated signals. The discrimination is composed of a quadrature measurement, a conditional displacement and a threshold detector.We propose and experimentally demonstrate a near-optimal discrimination scheme for the quadrature phase shift keying (QPSK) protocol. We show in theory that the performance of our hybrid scheme is superior to the standard scheme—heterodyne detection—for all signal amplitudes and underpin the predictions with our experimental results. Furthermore, our scheme provides hitherto the best performance in the domain of highly attenuated signals. The discrimination is composed of a quadrature measurement, a conditional displacement and a threshold detector.

arXiv:1204.0888New Journal of PhysicsAug 10, 201264 citations

QPSK Receiver outperforming the Standard Quantum Limit for any Signal Power

Christian R. Müller, Gerd Leuchs, Christoph Marquardt

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.

Jan 1, 20141 citation

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

Jasminder S. Sidhu, Shuro Izumi, Jonas Schou Neergaard-Nielsen +2 more

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, our receiver only exploits auxiliary coherent-state fields, linear optics, 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.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, our receiver only exploits auxiliary coherent-state fields, linear optics, 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.

Sep 7, 20201 citation

Hybrid quantum receiver for quadrature amplitude modulation coherent-state discrimination beating the classical limit

Chen Tian, Ke Li, Yuan Zuo +1 more

We present a quantum receiver for quadrature amplitude modulation (QAM) coherent-state discrimination with the homodyne-displacement hybrid structure. Our strategy is to carry out two successive measurements on parts of the quantum states. The homodyne result of the first measurement reveals partial information about the state and is forwarded to a displacement receiver, which finally identifies the input state by using feedback to adjust a reference field. Theoretical analysis and numerical simulation results show that for 16-QAM, the hybrid receiver could outperform the standard quantum limit using only on-off single-photon detectors with a reduced number of signal-state partitions, showing great potential toward implementing the receiver practically.We present a quantum receiver for quadrature amplitude modulation (QAM) coherent-state discrimination with the homodyne-displacement hybrid structure. Our strategy is to carry out two successive measurements on parts of the quantum states. The homodyne result of the first measurement reveals partial information about the state and is forwarded to a displacement receiver, which finally identifies the input state by using feedback to adjust a reference field. Theoretical analysis and numerical simulation results show that for 16-QAM, the hybrid receiver could outperform the standard quantum limit using only on-off single-photon detectors with a reduced number of signal-state partitions, showing great potential toward implementing the receiver practically.

Applied OpticsJan 29, 20185 citations

Four-state discrimination scheme beyond the heterodyne limit

Müller, Usuga, Wittmann +4 more

Conference on Lasers and Electro-OpticsJan 1, 20120 citations

Four-state discrimination scheme beyond the heterodyne limit

Christian R. Müller, Mario A. Usuga Castaneda, Christoffer Wittmann +4 more

Jan 1, 20120 citations

Four-state discrimination beyond heterodyne detection

Abstract

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Four-state discrimination beyond heterodyne detection

Abstract

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