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Fault tolerant quantum secure direct communication with quantum encryption against collective noise

Chinese Physics B 2012年第10期21卷 101-109页

作者：黄伟温巧燕贾恒越秦素娟高飞 State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications State Key Laboratory of Integrated Services Network Xidian University

We present two novel quantum secure direct communication（QSDC） protocols over different collective-noise *** from the previous QSDC schemes over collective-noise channels,which are all source-encrypting protocols,our two protocols are based on *** both schemes,two authorized users first share a sequence of EPR pairs as their reusable quantum *** they use their quantum key to encrypt and decrypt the secret message carried by the decoherence-free states over the collective-noise *** theory,the intrinsic efficiencies of both protocols are high since there is no need to consume any entangled states including both the quantum key and the information carriers except the ones used for eavesdropping *** checking eavesdropping,the two parties only need to perform two-particle measurements on the decoy states during each ***,we make a security analysis of our two protocols and demonstrate that they are secure.

关键词： quantum cryptography quantum secure direct communication quantum encryption collective noise

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Multiparty quantum secret conference based on quantum encryption with pure entangled states

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Chinese Physics B 2009年第6期18卷 2137-2142页

作者：顾斌李传起陈玉林 College of Math and Physics Nanjing University of Information Science and Technology

We present a scheme for multiparty quantum remote secret conference （MQRSC） with pure entangled states, not maximally entangled multipartite quantum systems. The conferees first share a private quantum key, a sequence of pure entangled states and then use them to encode and decode the secret messages. The conferees exploit the decoy-photon technique to ensure the security of the transmission of qubits. This MQRSC scheme is more feasible and efficient than others.

关键词： quantum secret conference pure entangled states quantum encryption

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A quantum encryption scheme using d-level systems

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Chinese Physics B 2006年第8期15卷 1690-1694页

作者：郭奋卓高飞温巧燕朱甫臣 School of Science Beijing University of Posts and Telecommunications Beijing 100876 China State Key Laboratory of Integrated Services Network Xidian University Xi'an 710071 China National Laboratory for Modern Communications P.O. Box 810 Chengdu 610041 China

Using the generalized Bell states and quantum gates, we introduce a quantum encryption scheme of d-level states （qudits）. The scheme can detect and correct arbitrary transmission errors using only local operations and classical communications between the communicators. In addition, the entanglement key used to encrypt can be recycled. The protocol is informationally secure, because the output state is a totally mixed one for every input state p.

关键词： quantum encryption d-level quantum cryptography quantum information

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