Feasibility of quantum key distribution with macroscopically bright coherent light

Feasibility of quantum key distribution with macroscopically bright coherent light

We address feasibility of continuous-variable quantum key distribution using bright multimode coherent states of light and homodyne detection. We experimentally verify the possibility to properly select signal modes by matching them with the local oscillator and this way to decrease the quadrature n...

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Veröffentlicht in:Optics express 2019-12, Vol.27 (25), p.36154-36163
Hauptverfasser: Kovalenko, Olena, Spasibko, Kirill Yu, Chekhova, Maria V, Usenko, Vladyslav C, Filip, Radim
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container_end_page 36163
container_issue 25
container_start_page 36154
container_title Optics express
container_volume 27
creator Kovalenko, Olena
Spasibko, Kirill Yu
Chekhova, Maria V
Usenko, Vladyslav C
Filip, Radim
description We address feasibility of continuous-variable quantum key distribution using bright multimode coherent states of light and homodyne detection. We experimentally verify the possibility to properly select signal modes by matching them with the local oscillator and this way to decrease the quadrature noise concerned with unmatched bright modes. We apply the results to theoretically predict the performance of continuous-variable quantum key distribution scheme using multimode coherent states in scenarios where modulation is applied either to all the modes or only to the matched ones, and confirm that the protocol is feasible at high overall brightness. Our results open the pathway towards full-scale implementation of quantum key distribution using bright light, thus bringing quantum communication closer to classical optics.
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title Feasibility of quantum key distribution with macroscopically bright coherent light
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