A multi-mode free-space delay interferometer with no refractive compensation elements for phase-encoded QKD protocols

Tretiakov, V.V.; Kravtsov, K.S.; Klimov, A.N.; Kulik, S.P.

Авторы: Tretiakov V.V., Kravtsov K.S., Klimov A.N., Kulik S.P.
Журнал: Laser Physics Letters
Том: 21
Год издания: 2024
Издательство: Wiley - VCH Verlag GmbH & CO. KGaA
Местоположение издательства: Germany
Первая страница: 065206
Последняя страница: 065212
Номер статьи: 065206
DOI: 10.1088/1612-202X/ad3a56
Аннотация: We demonstrate a compensation-free approach to the realization of multi-mode delayinterferometers, mainly for use in phase-encoded quantum key distribution (QKD). Highinterference visibility of spatially multi-mode beams in unbalanced Michelson orMach–Zehnder interferometers with a relatively wide range of delays is achieved by theappropriate choice of the transverse size of the beam. We provide a simple theoretical modelthat gives a direct connection between the visibility of interference, the delay and the beamparameters. The performed experimental study confirms our theoretical findings anddemonstrates measured visibility of up to 0.95 for a delay of 2 ns. Our approach’s simplicity androbust performance make it a practical choice for the implementation of QKD systems, where aquantum signal is received over a multi-mode fiber. The important application of such aconfiguration is an intermodal QKD system, where the free-space atmospheric communicationchannel is coupled into a span of the multi-mode fiber, delivering the spatially distorted beam tothe remote receiver with minimal coupling loss.
Добавил в систему: Кулик Сергей Павлович

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A multi-mode free-space delay interferometer with no refractive compensation elements for phase-encoded QKD protocolsстатья

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