Efficient quantum key distribution scheme with nonmaximally entangled states

Details Efficient quantum key distribution scheme with nonmaximally entangled states Efficient quantum key distribution scheme with nonmaximally entangled states

2001-01-11

arxiv.org/abs/quant-ph/0101043v1

Phys. Rev. A 64 (2001) 032305.

Physics

Quantum Physics

5 Pages, No Figure

Scientific paper

10.1103/PhysRevA.64.032305

We propose an efficient quantum key distribution scheme based on entanglement. The sender chooses pairs of photons in one of the two equivalent nonmaximally entangled states randomly, and sends a sequence of photons from each pair to the receiver. They choose from the various bases independently but with substantially different probabilities, thus reducing the fraction of discarded data, and a significant gain in efficiency is achieved. We then show that such a refined data analysis guarantees the security of our scheme against a biased eavesdropping strategy.

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