Related papers: Tightening the eavesdropping accessible informatio…

We present and analyze a quantum key distribution protocol based on sending entangled N-qubit states instead of single-qubit ones as in the trail-blazing scheme by Bennett and Brassard (BB84). Since the qubits are sent individually, an…

In a recent paper [A. Cabello, Phys. Rev. A 61, 052312 (2000)], a quantum key distribution protocol based on entanglement swapping was proposed. However, in this comment, it is shown that this protocol is insecure if Eve use a special…

The paper has been withdrawn

We show an eavesdropping scheme, by which the eavesdropper can achieve the full information of the key against the protocol [Kye et al., PRL 95 040501 (2005)] with a probability of unity and will not be discovered by the the legitimate…

This paper has been withdrawn by the author. It will be published again after submission to a journal.

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The paper has been withdrawn.

The paper was retracted.

This paper has been withdrawn and replaced by quant-ph/0609207.

This paper has been withdrawn due to security loophole. We thank Dr G. P. he for pointing this to us.

This paper has been temporarily withdrawn by the authors.

This paper has been withdrawn, and will be superseded by another submission.

This paper has been withdrawn by the author due to the need for further revision.

This paper has been withdrawn because the first author submitted the paper without previously consulting the rest of the authors.

This paper has been withdrawn by the author due to errors.

The ability to distribute secret keys between two parties with information-theoretic security, that is, regardless of the capacities of a malevolent eavesdropper, is one of the most celebrated results in the field of quantum information…

The paper has been withdrawn.

This paper has been withdrawn by the authors, due to the discovery of paper 0201028 which predates it and contains most of it's results.

This paper has been withdrawn by the authour.

In this paper, we investigate properties of some multi-particle entangled states and, from the properties applying the secret sharing present a new type of quantum key distribution protocols as generalization of quantum key distribution…