Quantum Correlations over Long-distances Using Noisy Quantum Repeaters

Details Quantum Correlations over Long-distances Using Noisy Quantum Repeaters Quantum Correlations over Long-distances Using Noisy Quantum Repeaters

2008-03-10

arxiv.org/abs/0803.1350v1

Physics

Quantum Physics

4 + epsilon pages, 2 figures

Scientific paper

Quantum correlations as the resource for quantum communication can be distributed over long distances by quantum repeaters. In this Letter, we introduce the notion of a noisy quantum repeater, and examine its role in quantum communication. Quantum correlations shared through noisy quantum repeaters are then characterized and their secrecy properties are studied. Remarkably, noisy quantum repeaters naturally introduce private states in the key distillation scenario, and consequently key distillation protocols are demonstrated to be more tolerant.

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