Forcible-Measurement Attack on Quantum Secure Direct Communication Protocol with Cluster State

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2008,（8）
• 页码范围: 2766-2769
• 页数: 4页
• 语种: 英文

摘要

The security of the quantum secure direct communication (QSDC) protocol with duster state is analysed. It is shown that the secret would be partially leaked out when an eavesdropper performs forcible measurements on the transmitted particles. With the help of the result in minimum error discrimination, an upper bound (i.e.40%) of this leakage is obtained. Moreover, the particular measurements which makes the leakage reach this bound are given.