We prove the unconditional security of the standard six-state scheme for quantum key
distribution (QKD). We demonstrate its unconditional security up to a bit error rate of 12.7 …

Shor and Preskill (see Phys. Rev. Lett., vol. 85, p. 441, 2000) have provided a simple proof
of security of the standard quantum key distribution scheme by Bennett and Brassard (1984) …

The security of quantum key distribution (QKD) has been proven for different protocols, in
particular for the BB84 protocol. It has been shown that this scheme is robust against …

We present an approach to the unconditional security of quantum key distribution protocols
based on the uncertainty principle. The approach applies to every case that has been …

We devise a simple modification that essentially doubles the efficiency of the BB84 quantum
key distribution scheme proposed by Bennett and Brassard. We also prove the security of …

Quantum Information Theory is an area of physics which studies both fundamental and
applied issues in quantum mechanics from an information-theoretical viewpoint. The …

With the help of a simple quantum key distribution (QKD) scheme, we discuss the relation
between BB84-type protocols and two-step-type ones. It is shown that they have the same …

We prove that the 1984 protocol of Bennett and Brassard (BB84) for quantum key
distribution is secure. We first give a key distribution protocol based on entanglement …

We provide security bounds against coherent attacks for two families of quantum key
distribution protocols that use d-dimensional quantum systems. In the asymptotic regime …

We present a complete protocol for BB84 quantum key distribution for a realistic setting
(noise, loss, multi-photon signals of the source) that covers many of todays experimental …