This article is cited in 1 paper

Trends in the developments quantum communications

Influence of birefringent fibre joints on the visibility drift in a Mach–Zehnder interferometer

G. M. Krylov^abcd, O. V. Fat'yanov^abc, A. V. Duplinskiy<sup>abce

a</sup> QRate, Moscow
^b Russian Quantum Center, Moscow, Skolkovo
^c Quantum Communications Centre of NTI, National University of Science and Technology MISiS, Moscow
^d National Engineering Physics Institute "MEPhI", Moscow
^e Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow Region

Abstract: It is shown that imperfect joints of linear birefringent fibres in a fibre interferometer may result in an uncontrolled visibility drift under varying environmental conditions even with a standard phase matching device. As an example, a double Mach–Zehnder interferometer is considered, which is employed in schemes of quantum key distribution. Results of numerical simulation demonstrate the standard deviation of the quantum bit error rate (QBER), which is comparable to an average QBER value.

Keywords: quantum key distribution, visibility, polarisation extinction ratio, interferometer.

Received: 21.11.2019
Revised: 31.01.2020

 English version: Quantum Electronics, 2020, 50:5, 447–453

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