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Singular value decomposition assisted multicarrier continuous-variable quantum key distribution

Singular value decomposition assisted multicarrier continuous-variable quantum key distribution
Singular value decomposition assisted multicarrier continuous-variable quantum key distribution

We define the singular value decomposition (SVD) assisted multicarrier continuous-variable quantum key distribution (CVQKD) protocol. The proposed protocol 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 SVD-assistance defines the eigenchannels of the Gaussian physical link, which can be used for the simultaneous reliable transmission of multiple user data streams. Our transmission model also includes the singular interference avoider (SIA) precoding scheme. The proposed SIA precoding scheme prevents the eigenchannel interference to reach an optimal transmission over a Gaussian link. We demonstrate the results through the adaptive multicarrier quadrature division–multiuser quadrature allocation (AMQD-MQA) CVQKD multiple-access scheme. The singular value assisted transmission provides improved simultaneous transmission rates for the users, particularly in crucial low signal-to-noise ratio regimes.

Continuous-variables, Quantum communications, Quantum cryptography, Quantum key distribution, Quantum Shannon theory
0304-3975
Gyongyosi, Laszlo
bbfffd90-dfa2-4a08-b5f9-98376b8d6803
Gyongyosi, Laszlo
bbfffd90-dfa2-4a08-b5f9-98376b8d6803

Gyongyosi, Laszlo (2019) Singular value decomposition assisted multicarrier continuous-variable quantum key distribution. Theoretical Computer Science. (doi:10.1016/j.tcs.2019.07.029).

Record type: Article

Abstract

We define the singular value decomposition (SVD) assisted multicarrier continuous-variable quantum key distribution (CVQKD) protocol. The proposed protocol 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 SVD-assistance defines the eigenchannels of the Gaussian physical link, which can be used for the simultaneous reliable transmission of multiple user data streams. Our transmission model also includes the singular interference avoider (SIA) precoding scheme. The proposed SIA precoding scheme prevents the eigenchannel interference to reach an optimal transmission over a Gaussian link. We demonstrate the results through the adaptive multicarrier quadrature division–multiuser quadrature allocation (AMQD-MQA) CVQKD multiple-access scheme. The singular value assisted transmission provides improved simultaneous transmission rates for the users, particularly in crucial low signal-to-noise ratio regimes.

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More information

Accepted/In Press date: 16 July 2019
e-pub ahead of print date: 19 July 2019
Keywords: Continuous-variables, Quantum communications, Quantum cryptography, Quantum key distribution, Quantum Shannon theory

Identifiers

Local EPrints ID: 434267
URI: http://eprints.soton.ac.uk/id/eprint/434267
ISSN: 0304-3975
PURE UUID: 850524ea-b874-45c2-a6ba-a81664907f0d

Catalogue record

Date deposited: 18 Sep 2019 16:30
Last modified: 18 Sep 2019 16:30

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Contributors

Author: Laszlo Gyongyosi

University divisions

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