Adaptive multicarrier quadrature division modulation for long-distance continuous-variable quantum key distribution

L. Gyongyosi; S. Imre

doi:10.1117/12.2050095

22 May 2014 Adaptive multicarrier quadrature division modulation for long-distance continuous-variable quantum key distribution

L. Gyongyosi, S. Imre

Author Affiliations +

Proceedings Volume 9123, Quantum Information and Computation XII; 912307 (2014) https://doi.org/10.1117/12.2050095
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

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.

Citation Download Citation

L. Gyongyosi and S. Imre "Adaptive multicarrier quadrature division modulation for long-distance continuous-variable quantum key distribution", Proc. SPIE 9123, Quantum Information and Computation XII, 912307 (22 May 2014); https://doi.org/10.1117/12.2050095

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