Participant attack on quantum secret sharing based on entanglement swapping

• 来源期刊: 中国物理B（英文版）
• 关键词: quantum secret sharing entanglement swapping the Bell measurement two-particle entangled state
• 年，卷（期）: 2009,（4）
• 页码范围: 1333-1337
• 页数: 5页
• 语种: 英文

摘要

The security of quantum secret sharing based on entanglement swapping is revisited and a participant attack is presented.In this attack two dishonest agents together can illegally recover the secret quantum state without the help of any other controller,and it will not be detected by any othcr users.Furthermore,by modifying the distribution process of particles and adding a detection step after each distribution process,we propose an improved protocol which can resist this kind of attack.