Quantum displacement receiver for M-ary phase-shift-keyed coherent states

Izumi, Shuro; Takeoka, Masahiro; Fujiwara, Mikio; Pozza, Nicola Dalla; Assalini, A.; Ema, Kazuhiro; Sasaki, Masahide

doi:10.1063/1.4903095

Cited by 15 publications

(32 citation statements)

References 1 publication

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“…In addition to binary state discrimination, various types of quantum receivers have been developed for quaternary phase shift keying (QPSK) coherent states [24][25][26][27][28][29][30]. A significant improvement of the discrimination error beyond the SQL has been experimentally observed by optimizing the feedback strategy according to the a posteriori probability for observed events [28].…”

Section: Introductionmentioning

confidence: 99%

Experimental demonstration of a quantum receiver beating the standard quantum limit at the telecom wavelength

Izumi,

Neergaard-Nielsen,

Miki

et al. 2020

Preprint

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Discrimination of coherent states beyond the standard quantum limit (SQL) is an important task not only for quantum information processing but also for optical coherent communication. In order to optimize long distance optical fiber networks, it is of practical importance to develop a quantum receiver beating the SQL and approaching the quantum bound at telecom wavelength. In this paper, we experimentally demonstrate a receiver beating the conventional SQL at telecom wavelength. Our receiver is composed of a displacement operation, a single photon counter and a real time adaptive feedback operation. By using a high performance single photon detector operating at the telecom wavelength, we achieve a discrimination error beyond the SQL. The demonstration in the telecom band provides the first step important towards quantum and classical communication beyond the SQL using a coherent state alphabet, and we envision that the technology can be used for longdistance quantum key distribution, effective quantum state preparation and quantum estimation.

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Section: Introductionmentioning

confidence: 99%

Experimental demonstration of a quantum receiver beating the standard quantum limit at the telecom wavelength

Izumi,

Neergaard-Nielsen,

Miki

et al. 2020

Preprint

Self Cite

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“…Mueller et al proposed and experimentally demonstrated a discrimination of QPSK signals with a hybrid receiver that executes sequential detection of a heterodyne detector and a displacement receiver [10]. Recently a multiple-stage displacement receiver based on the feedforward principle for 3-PSK and 4-PSK signals has been proposed [11,12]. In the discrimination process, the amount of displacement is determined from the results of the previous stages.…”

Section: Introductionmentioning

confidence: 99%

Performance gain of displacement receiver with optimized prior probability

et al. 2013

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Abstract:We numerically study the performance of the displacement based quantum receiver for the discrimination of weak 3-and 4-phase-shift keyed (PSK) coherent state signals. We show that due to the nontrivial asymmetry of the receiver structure, optimization of the prior probability increases the mutual information and achieves sub-shot-noise limit discrimination. Moreover, we estimate the cutoff rate for a 4-PSK signal and confirm that the prior probability optimization shortens the code length for a given decoding error criterion. Such consideration for the asymmetric channel matrix is essential in a study of the compassable quantum receiver.

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“…In optical communication at very low power regime, it is known that homodyne or heterodyne measurements are not optimal to minimize the error of discriminating modulated coherent state signals [13]. In the last decade, practical quantum receiver configuration superior to homodyne and heterodyne receivers has been proposed for various set of signals [14][15][16][17][18][19][20][21] and successfully demonstrated with the current technology [22][23][24][25][26][27][28][29]. Our basic idea is to apply these receivers -originally designed for state discrimination-for a different purpose, i.e.…”

Section: Introductionmentioning

confidence: 99%

Optical phase estimation via the coherent state and displaced-photon counting

et al. 2016

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We consider the phase sensing via weak optical coherent state at quantum limit precision. A new detection scheme for the phase estimation is proposed which is inspired by the suboptimal quantum measurement in coherent optical communication. We theoretically analyze a performance of our detection scheme, which we call the displaced-photon counting, for phase sensing in terms of the Fisher information and show that the displaced-photon counting outperforms the static homodyne and heterodyne detections in wide range of the target phase. The proof-of-principle experiment is performed with linear optics and a superconducting nanowire single photon detector. The result shows that our scheme overcomes the limit of the ideal homodyne measurement even under practical imperfections.

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Quantum displacement receiver for M-ary phase-shift-keyed coherent states

Cited by 15 publications

References 1 publication

Experimental demonstration of a quantum receiver beating the standard quantum limit at the telecom wavelength

Experimental demonstration of a quantum receiver beating the standard quantum limit at the telecom wavelength

Performance gain of displacement receiver with optimized prior probability

Optical phase estimation via the coherent state and displaced-photon counting

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