Quantum dense key distribution

Abstract

This paper proposes a new protocol for quantum dense key distribution. This protocol embeds the benefits of a quantum dense coding and a quantum key distribution and is able to generate shared secret keys four times more efficiently than BB84 one. We hereinafter prove the security of this scheme against individual eavesdropping attacks, and we present preliminary experimental results, showing its feasibility.

Classical Correlation in Quantum Dialogue

“…There are three types of QD protocols, quantum dense key distribution using entanglement [11] which is the prototype of quantum dialogue, QD protocol based on EPR pairs [12] and QD protocol with single photon sources [13]. Let us briefly review the idea of QD here [12].…”

“…In this paper, we prove that QD protocol presented by [11,12,13,14] are insecure because classical com- * Electronic address: qycai@wipm.ac.cn munication is erroneously used in these protocols. Alice and Bob's encoding operations are correlated given the published measurement results.…”

“…Our calculations show that Eve can gain half information of Alice and Bob's secret message only by listening the classical channel. By applying Holevo bound, we can see that the quantum efficiency claimed in the quantum dialogue type of protocols [11,12,13,14] is not achievable.…”

“…In the QSDC protocols, Bob can decode Alice's encoded message directly after his measurement and they don't need to do basis reconciliation. Based on the idea of QSDC, a new type of quantum communication protocol, called quantum dialogue (QD), has been presented [11,12,13,14].…”

An Integrated Hierarchical Dynamic Quantum Secret Sharing Protocol

“…Since then a large number of alternative protocols of unconditionally secure QKD have been proposed [2,3,4,5] and various aspects of secure quantum communication beyond QKD have been explored [6,7,8,9,10,11,12,13]. For example, a large number of protocols have been proposed for quantum secure direct communication (QSDC) [7,8,14,15,16], deterministic secure quantum communication (DSQC) [9,10,17,18,19,20,21,22], quantum dialogue (QD) [23,24], etc. All these protocols differ from each other in some specific features.…”