Security of quantum key distribution protocol with two-way classical communication assisted by one-time pad encryption

Details Security of quantum key distribution protocol with two-way classical communication assisted by one-time pad encryption Security of quantum key distribution protocol with two-way classical communication assisted by one-time pad encryption

2006-08-03

arxiv.org/abs/quant-ph/0608030v3

Physics

Quantum Physics

12 pages, 2 figure, version 2 corrected typo errors, version 3 added the analysis of the key rate in the BB84 protocol

Scientific paper

In this paper, we consider a quantum key distribution protocol (QKD) with two-way classical communication that is assisted by one-time pad encryption. We propose a two-way preprocessing that uses one-time pad encryption by previously shared secret key, and the net key rate of the QKD with proposed preprocessing exceeds the key rate of the QKD without it. The preprocessing is reduced to the entanglement distillation protocol with two-way classical communication and previously shared EPR pairs (two-way breeding protocol), and the security of QKD with the preprocessing is guaranteed in the same way as Shor and Preskill's arguments.

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