High error-rate quantum key distribution for long-distance communication

Details High error-rate quantum key distribution for long-distance communication High error-rate quantum key distribution for long-distance communication

2009-01-25

arxiv.org/abs/0901.3909v4

New J. Phys. 11, 063043 (2009).

Physics

Quantum Physics

17 pages, 3 figures, 4 tables, discussion of QBER added

Scientific paper

In the original BB84 protocol by Bennett and Brassard, an eavesdropper is detected because his attempts to intercept information result in a quantum bit error rate (QBER) of at least 25%. Here we design an alternative quantum key distribution protocol, where Alice and Bob use two mutually unbiased bases with one of them encoding a "0" and the other one encoding a "1." The security of the scheme is due to a minimum index transmission error rate (ITER) introduced by an eavesdropper which increases significantly for higher-dimensional photon states. This allows for more noise in the transmission line, thereby increasing the possible distance between Alice and Bob without the need for intermediate nodes.

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