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Communications in Theoretical Physics

Controlled Secure Quantum Communication Using Pure Entangled W Class States

Yan Xia, Song Jie, He‐Shan Song

Published Apr 1, 2008• 19 citations
Publisher

Abstract

We present a controlled secure quantum communication protocol using non-maximally (pure) entangled W states first, and then discuss the basic requirements for a real quantum communication. We show that the authorized two users can exchange their secret messages with the help of the controller after purifying the non-maximally entangled states quantum channel unconditionally securely and simultaneously. Our quantum communication protocol seems even more feasible within present technologies.

DOI
10.1088/0253-6102/49/4/24

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•Jun 1, 2006•4 citations
We present a controlled secure quantum communication protocol using non-maximally (pure) entangled W states first, and then discuss the basic requirements for a real quantum communication. We show that the authorized two users can exchange their secret messages with the help of the controller after purifying the non-maximally entangled states quantum channel unconditionally securely and simultaneously. Our quantum communication protocol seems even more feasible within present technologies.
Two deterministic secure quantum communication schemes are proposed, one based on pure entangled states and the other on ddd-dimensional single-photon states. In these two schemes, only single-photon measurements are required for the two authorized users, which makes the schemes more convenient than others in practical applications. Although each qubit can be read out after a transmission of additional classical bit, it is unnecessary for the users to transmit qubits double the distance between the sender and the receiver, which will increase their bit rate and their security. The parties use decoy photons to check eavesdropping efficiently. The obvious advantage in the first scheme is that the pure entangled source is feasible with present techniques.
Two quantum secure direct communication schemes are proposed based on pure entangled states and ddd-dimensional single-photon states, respectively. In these two schemes, only single-photon measurements are required for the two authorized users and two practical quantum signal sources are used for carrying information, which makes the schemes more convenient than others in a practical application. Although each qubit can be read out after a transmission of additional classical information, it is unnecessary for the users to transmit qubits carrying the secret message, which will increase their bit rate and their security. The parties use decoy photons to check eavesdropping efficiently.