QKD with finite resources: secret key rates via Rényi entropies

Details QKD with finite resources: secret key rates via Rényi entropies QKD with finite resources: secret key rates via Rényi entropies

2011-05-27

arxiv.org/abs/1105.5574v1

Phys. Rev. A 84, 032321 (2011)

Physics

Quantum Physics

11 pages, 2 figures

Scientific paper

10.1103/PhysRevA.84.032321

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 R\'enyi 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.

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