Phys. Rev. Lett. 84, 4729–4732 (2000)Quantum Cryptography with Entangled Photons
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%. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.4729
DOI:
10.1103/PhysRevLett.84.4729
PACS:
03.67.Dd, 42.79.Sz, 89.80.+h
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