Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 20, Pages 4729-4732Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4729
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By realizing a quantum cryptography system based on polarization entangled photon pairs we establish highly secure keys, because a single photon source is approximated and the inherent randomness of quantum measurements is exploited. We implement a novel key distribution scheme using Wigner's inequality to test the security of the quantum channel, and, alternatively, realize a variant of the BB84 protocol. Our system has two completely independent users separated by 360 m, and generates raw keys at rates of 400-800 bits/s with bit error rates around 3%.
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