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

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3 Author(s)
G. B. Xavier ; Departamento de Ingenieria Electrica, Universidad de Concepcion, Casilla 160-C, Concepcion, Chile ; G. P. Temporao ; J. p. von der Weid

It is experimentally demonstrated that a long distance actively stabilised 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 highly stable visibility implying a quantum bit error rate of 2.2% is shown.

Published in:

Electronics Letters  (Volume:48 ,  Issue: 13 )