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Physical Review A

Quantum secure direct communication with high-dimension quantum superdense coding

Chuan Xi Wang, Fu‐Guo Deng, Yansong Li, Xiao-Shu Liu, Gui Lu Long

Published Apr 28, 2005• 934 citations
Publisher

Abstract

A protocol for quantum secure direct communication with quantum superdense coding is proposed. It combines the ideas of block transmission, the ping-pong quantum secure direct communication protocol, and quantum superdense coding. It has the advantage of being secure and of high source capacity.
DOI
10.1103/physreva.71.044305

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A quantum secure direct communication network scheme is proposed with quantum superdense coding and decoy photons. The servers on a passive optical network prepare and measure the quantum signal, i.e. a sequence of the d -dimensional Bell states. After confirming the security of the photons received from the receiver, the sender codes his secret message on them directly. For preventing a dishonest server from eavesdropping, some decoy photons prepared by measuring one photon in the Bell states are used to replace some original photons. One of the users on the network can communicate to any other one. This scheme has the advantage of high capacity, and it is more convenient than others as only a sequence of photons is transmitted in quantum line.