Classical Correlation in Quantum Dialogue

Details Classical Correlation in Quantum Dialogue Classical Correlation in Quantum Dialogue

2008-02-04

arxiv.org/abs/0802.0358v1

Int. J. Quant. Inf. 6, 325-329 (2008)

Physics

Quantum Physics

Here we point out the erroneous use of classical communication results in the insecurity of quantum dialogue protocols. Int. J

Scientific paper

Classical communications are used in the post-processing procedure of quantum key distribution. Since the security of quantum key distribution is based on the principles of quantum mechanics, intuitively the secret key can only be derived from the quantum states. We find that classical communications are incorrectly used in the so-called quantum dialogue type protocols. In these protocols, public communications are used to transmit secret messages. Our calculations show that half of Alice's and Bob's secret message is leaked through classical channel. By applying Holevo bound, we can see that the quantum efficiency claimed in the quantum dialogue type of protocols is not achievable.

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