Multiparty controlled quantum secure direct communication based on quantum search algorithm

Authors:
Shih-Hung Kao;Tzonelih Hwang
Affiliations:
Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan, Taiwan, ROC 701;Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan, Taiwan, ROC 701
Venue:
Quantum Information Processing
Year:
2013

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Abstract

In this study, a new controlled quantum secure direct communication (CQSDC) protocol using the quantum search algorithm as the encoding function is proposed. The proposed protocol is based on the multi-particle Greenberger---Horne---Zeilinger entangled state and the one-step quantum transmission strategy. Due to the one-step transmission of qubits, the proposed protocol can be easily extended to a multi-controller environment, and is also free from the Trojan horse attacks. The analysis shows that the use of quantum search algorithm in the construction of CQSDC appears very promising.