A New Quantum Secure Direct Communication Protocol Using Decoherence-Free Subspace
GE Hua1,2, LIU Wen-Yu1
1Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 4300742School of Information Engineering, Wuhan University of Technology, Wuhan 430070
A New Quantum Secure Direct Communication Protocol Using Decoherence-Free Subspace
GE Hua1,2;LIU Wen-Yu1
1Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 4300742School of Information Engineering, Wuhan University of Technology, Wuhan 430070
摘要A new quantum secure direct communication (QSDC) protocol is proposed by using decoherence free subspace (DFS) to avoid insecurity of the present QSDC protocols in a quantum noise channel. This protocol makes it easily for Bob and Alice to find eavesdropping in channel because the collective dephasing noise disappears in DFS. The probability of successful attack by Eve in this protocol is smaller than in BB84 protocol. Thus this protocol realizes secure QSDC and is feasible with present-day technology.
Abstract：A new quantum secure direct communication (QSDC) protocol is proposed by using decoherence free subspace (DFS) to avoid insecurity of the present QSDC protocols in a quantum noise channel. This protocol makes it easily for Bob and Alice to find eavesdropping in channel because the collective dephasing noise disappears in DFS. The probability of successful attack by Eve in this protocol is smaller than in BB84 protocol. Thus this protocol realizes secure QSDC and is feasible with present-day technology.
GE Hua;LIU Wen-Yu. A New Quantum Secure Direct Communication Protocol Using Decoherence-Free Subspace[J]. 中国物理快报, 2007, 24(10): 2727-2729.
GE Hua, LIU Wen-Yu. A New Quantum Secure Direct Communication Protocol Using Decoherence-Free Subspace. Chin. Phys. Lett., 2007, 24(10): 2727-2729.
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2007, Vol. 24 
