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Proceedings Paper

Adaptive Gaussian quadrature detection for continuous-variable quantum key distribution
Author(s): L. Gyongyosi; S. Imre
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Paper Abstract

We propose the adaptive quadrature detection for multicarrier continuous-variable quantum key distribution (CVQKD). A multicarrier CVQKD scheme uses Gaussian subcarrier continuous variables for the information conveying and Gaussian sub-channels for the transmission. The proposed multicarrier detection scheme dynamically adapts to the subchannel conditions using a corresponding statistics which is provided by our sophisticated sub-channel estimation procedure. The sub-channel estimation phase determines the transmittance coefficients of the sub-channels, which information are used further in the adaptive quadrature decoding process. We define a technique to estimate the transmittance conditions of the sub-channels. We introduce the terms of single and collective adaptive quadrature detection. We prove the achievable error probabilities, the signal-to-noise ratios, and quantify the attributes of the framework. The adaptive detection scheme allows to utilize the extra resources of multicarrier CVQKD and to maximize the amount of transmittable valuable information in diverse measurement and transmission conditions. The framework is particularly convenient for experimental CVQKD scenarios.

Paper Details

Date Published: 15 March 2016
PDF: 15 pages
Proc. SPIE 9762, Advances in Photonics of Quantum Computing, Memory, and Communication IX, 97620E (15 March 2016); doi: 10.1117/12.2211743
Show Author Affiliations
L. Gyongyosi, Budapest Univ. of Technology and Economics (Hungary)
Hungarian Academy of Sciences (Hungary)
S. Imre, Budapest Univ. of Technology and Economics (Hungary)

Published in SPIE Proceedings Vol. 9762:
Advances in Photonics of Quantum Computing, Memory, and Communication IX
Zameer Ul Hasan; Philip R. Hemmer; Hwang Lee; Alan L. Migdall, Editor(s)

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