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QKD with finite resources: secret key rates via Rényi entropies

A realistic Quantum Key Distribution (QKD) protocol necessarily deals with finite resources, such as the number of signals exchanged by the two parties. We derive a bound on the secret key rate which is expressed as an optimization problem over Rényi entropies. Under the assumption of collective attacks by an eavesdropper, a computable estimate of our bound for the six-state protocol is provided. This bound leads to improved key rates in comparison to previous results.

preprint2011arXivOpen access
Silvestre AbruzzoHermann KampermannMarkus MertzDagmar Bruß
quant-ph
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Open access4 authors1 topic
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Silvestre AbruzzoHermann KampermannMarkus MertzDagmar Bruß

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