Employing long fibre-optical Mach- Zehnder interferometers for quantum cryptography with orthogonal states

2012/06/13 by G. B. Xavier, Xavier, G. B., G. P. Temporao +3
Physics and Astronomy · #FOS: Physical sciences #Quantum Physics (quant-ph) #quant-ph

paper · pdf · doi:10.48550/arxiv.1206.2701

Accepted for publication in Electronics Letters, 2 pages, 2 figures

arxiv created 2012/06/13 · arxiv updated 2012/06/14

Abstract

We experimentally demonstrate that a long distance actively stabilized Mach-Zehnder fibre optical interferometer can be used to reliably implement the GV95 quantum cryptography protocol employing orthogonal states. A proof-of-principle experiment using an interferometer composed of 1 km of spooled optical fibres connecting Alice and Bob is performed. The active stabilisation against phase drifts is done with a classical channel wavelength-multiplexed with the quantum channel and a high stable visibility implying a QBER of 2.2 % is shown.

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