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Proceedings Paper

Adaptive multicarrier quadrature division modulation for long-distance continuous-variable quantum key distribution
Author(s): L. Gyongyosi; S. Imre
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Paper Abstract

We propose the adaptive multicarrier quadrature division (AMQD) modulation technique for continuous-variable quantum key distribution (CVQKD). The method granulates the Gaussian random input into Gaussian subcarrier continuous variables in the encoding phase, which are then decoded by a continuous unitary transformation. The subcarrier coherent variables formulate Gaussian sub-channels from the physical link with strongly diverse transmission capabilities, which leads to significantly improved transmission efficiency, higher tolerable loss, and excess noise. We also investigate a modulation-variance adaption technique within the AMQD scheme, which provides optimal capacityachieving communication over the sub-channels in the presence of a Gaussian noise.

Paper Details

Date Published: 22 May 2014
PDF: 15 pages
Proc. SPIE 9123, Quantum Information and Computation XII, 912307 (22 May 2014); doi: 10.1117/12.2050095
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. 9123:
Quantum Information and Computation XII
Eric Donkor; Andrew R. Pirich; Howard E. Brandt; Michael R. Frey; Samuel J. Lomonaco; John M. Myers, Editor(s)

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