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Proceedings Paper

Eigenchannel decomposition for continuous-variable quantum key distribution
Author(s): L. Gyongyosi; S. Imre
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Paper Abstract

We develop a singular layer transmission model for continuous-variable quantum key distribution (CVQKD). In CVQKD, the transmit information is carried by continuous-variable (CV) quantum states, particularly by Gaussian random distributed position and momentum quadratures. The reliable transmission of the quadrature components over a noisy link is a cornerstone of CVQKD protocols. The proposed singular layer uses the singular value decomposition of the Gaussian quantum channel, which yields an additional degree of freedom for the phase space transmission. This additional degree of freedom can further be exploited in a multiple-access scenario. The singular layer defines the eigenchannels of the Gaussian physical link, which can be used for the simultaneous reliable transmission of multiple user data streams. We demonstrate the results through the adaptive multicarrier quadrature division–multiuser quadrature allocation (AMQD-MQA) CVQKD multiple-access scheme. We define the singular model of AMQD-MQA and characterize the properties of the eigenchannel interference. The singular layer transmission provides improved simultaneous transmission rates for the users with unconditional security in a multiple-access scenario, particularly in crucial low signal-to-noise ratio regimes.

Paper Details

Date Published: 4 March 2015
PDF: 15 pages
Proc. SPIE 9377, Advances in Photonics of Quantum Computing, Memory, and Communication VIII, 937711 (4 March 2015); doi: 10.1117/12.2076532
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. 9377:
Advances in Photonics of Quantum Computing, Memory, and Communication VIII
Zameer Ul Hasan; Philip R. Hemmer; Hwang Lee; Alan L. Migdall, Editor(s)

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