Threshold quantum secure direct communication without entanglement

• 来源期刊: 中国科学G辑（英文版）
• 年，卷（期）: 2008,（2）
• 页码范围: 176-183
• 页数: 8页
• 语种: 英文
• DOI: 10.1007/s 11433-008-0028-3

摘要

For the first time, a threshold quantum secure direct communication (TQSDC) scheme is presented. Similar to the classical Shamir's secret sharing scheme, the sender makes n shares, S1,…, Sn of secret key Kand each receiver keeps a share secretly. If the sender wants to send a secret message M to the receivers, he en-codes the information of Kand M on a single photon sequence and sends it to one of the receivers. According to the secret shares, the t receivers sequentially perform the corresponding unitary operations on the single photon sequence and obtain the secret message M. The shared shares may be reusable if it can be judged that there is no eavesdropper in line. We discuss that our protocol is feasible with current technology.