Revisiting controlled quantum secure direct communication using a non-symmetric quantum channel with quantum superdense coding

2006/12/25 by Jun Liu, Liu, Jun, Zhan-jun Zhang +1
Physics and Astronomy · #FOS: Physical sciences #Quantum Physics (quant-ph) #quant-ph

paper · pdf · doi:10.48550/arxiv.quant-ph/0612206

5 pages

arxiv created 2007/01/02 · arxiv updated 2009/12/01

Abstract

Recently Xia and Song [Phys. Lett. A (In press)] have proposed a controlled quantum secure direct communication (CQSDC) protocol. They claimed that in their protocol only with the help of the controller Charlie, the receiver Alice can successfully extract the secret message from the sender Bob. In this letter, first we will show that within their protocol the controller Charlie's role can be excluded due to their unreasonable design. We then revise the Xia-Song CQSDC protocol such that its original advantages are retained and the CQSDC can be really realized.

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