Lower and upper bounds on the secret key rate for QKD protocols using one--way classical communication

Details Lower and upper bounds on the secret key rate for QKD protocols using one--way classical communication Lower and upper bounds on the secret key rate for QKD protocols using one--way classical communication

2004-10-26

arxiv.org/abs/quant-ph/0410215v2

Phys. Rev. Lett. 95, 080501 (2005)

Physics

Quantum Physics

minor changes, results for BB84 and B92 added

Scientific paper

10.1103/PhysRevLett.95.080501

We investigate a general class of quantum key distribution (QKD) protocols using one-way classical communication. We show that full security can be proven by considering only collective attacks. We derive computable lower and upper bounds on the secret key rate of those QKD protocol involving only entropies of two--qubit density operators. As an illustration of our results, we determine new bounds for the BB84, the six-state, and the B92 protocol. We show that in all these cases the first classical processing that the legitimate partners should apply consists in adding noise. This is precisely why any entanglement based proof would generally fail here.

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