Device-independent quantum secure direct communication against collective attacks

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2020,（1）
• 页码范围: 12-20
• 页数: 9页
• 语种: 英文

摘要

"Device-independent" not only represents a relaxation of the security assumptions about the internal working of the quantum devices,but also can enhance the security of the quantum communication.In the paper,we put forward the first device-independent quantum secure direct communication (DI-QSDC) protocol and analyze its security and communication efficiency against collective attacks.Under practical noisy quantum channel condition,the photon transmission loss and photon state decoherence would reduce DI-QSDC's communication quality and threaten its absolute security.For solving the photon transmission loss and decoherence problems,we adopt noiseless linear amplification (NLA) protocol and entanglement purification protocol (EPP) to modify the DI-QSDC protocol.With the help of the NLA and EPP,we can guarantee DI-QSDC's absolute security and effectively improve its communication quality.