Physics – Quantum Physics
Scientific paper
2008-10-02
Quantum Information & Computation 9, 0683-0692, 2009
Physics
Quantum Physics
10 pages, 3 figures
Scientific paper
A simple protocol which takes advantage of the inherent random times of detections in single photon counting modules is presented for random active basis choices when using entanglement-based protocols for Quantum Key Distribution (QKD). It may also be applicable to the BB84 protocol in certain cases. The scheme presented uses the single photon detectors already present on a QKD setup, working on the same rate as the system is capable of detecting, and is, therefore, not limited by the output rates of quantum random number generators. This protocol only requires small hardware modifications making it an attractive solution. We perform a proof-of-principle experiment employing a spontaneous parametric down-conversion process in a $\chi^{(2)}$ non-linear crystal to demonstrate the feasibility of our scheme, and show that the generated sequence passes randomness tests.
da Silva Ferreira T.
de Faria Vilela G.
der Weid Jean Pierre von
Temporão Guilherme P.
Xavier G. B.
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