Experimental error filtration for quantum communication over highly noisy channels
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Updated: Aug 16, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
Published on: April 4, 2017
L-P Lamoureux1, E Brainis, N J Cerf
1Quantum Information and Communication, Ecole Polytechnique, CP 165/59, Université Libre de Bruxelles, Avenue F. D. Roosevelt 50, 1050 Brussels, Belgium.
Abstract:
Error filtration is a method for encoding the quantum state of a single particle into a higher dimensional Hilbert space in such a way that it becomes less sensitive to noise. We have realized a fiber optics demonstration of this method and illustrated its potentialities by carrying out the optical part of a quantum key distribution scheme over a line whose phase noise is too high for a standard implementation of BB84 to be secure. By filtering out the noise, a bit error rate of 15.3% +/- 0.1%, which is beyond the security limit, can be reduced to 10.6% +/- 0.1%, thereby guaranteeing the cryptographic security.
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