Physics – Quantum Physics
Scientific paper
2011-11-11
Proc. SPIE 8189, 818917 (2011)
Physics
Quantum Physics
Scientific paper
10.1117/12.898049
The six-state protocol is a discrete-variable protocol for quantum key distribution, that permits to tolerate a noisier channel than the BB84 protocol. In this work we provide a lower bound on the maximum achievable key rate of a practical implementation of the entanglement-based version of the six-state protocol. Regarding the experimental set-up we consider that the source is untrusted and the photon-number statistics is measured using photon-number-resolving detectors. We provide the formula for the key rate for a finite initial number of resources. As an illustration of the considered formalism, we calculate the key rate for the setting where the source produces entangled photon pairs via parametric down-conversion and the losses in the channel depend on the distance. As a result we find that the finite-key corrections for the considered scenario are not negligible and they should be considered in any practical analysis.
Abruzzo Silvestre
Bruß Dagmar
Kampermann Hermann
Mertz Markus
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