Abstract: This paper introduces a new controlled quantum protocol for secure direct communication .We present a controlled three-party communication protocol using Greenberger-Horne-Zeilinger (GHZ)-like state and imperfect Bell-state measurement. In this paper, the receiver can obtain the sender’s two-secret bits under the permission of the controller. In order to transmit two bits secret message, entanglement swapping is utilized. Therefore, no qubits carrying the secret messages are transmitted .Also, this protocol is unconditionally secure, if the perfect quantum channel is used. The motivation behind utilizing GHZ-like state as a quantum channel is that if a qubit is lost in the GHZ-like state the other two qubits are still entangled. The proposed protocol improves the efficiency of the previous ones. It is shown that one of these protocols is maximally efficient and that can be modified to an equivalent protocol of quantum secure direct communication (CQSDC). Security and efficiency of the controlled proposed protocols are analyzed and compared.
Keywords: controlled quantum secrue direct communication; entanglement swapping; GHZ-like state; quantum cryptography.
Title: Controlled Quantum Secure Direct Communication
Author: JIN Yao-yao, HU Zhan-ning, KONG Ling-hao, SUN Zhao-long, LIU Qian
International Journal of Computer Science and Information Technology Research
ISSN 2348-1196 (print), ISSN 2348-120X (online)
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