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

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3 Author(s)
Xavier, G.B. ; Dept. de Ing. Electr., Univ. de Concepcion, Concepción, Chile ; Temporão, G.P. ; von der Weid, J.P.

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 )

Date of Publication:

June 21 2012

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