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

G. B. Xavier, G. P. Temporao and J. P. von der Weid
ELECTRONICS LETTERS 48, 13 (2012)

ABSTRACT

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.

DOI: http://dx.doi.org/10.1049/el.2012.0850



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