Quantum Cryptography with Entangled QuNits
ENG Hong-Liang, FANG Xi-Ming
Department of Physics, Hunan Normal University, Changsha 410081
Quantum Cryptography with Entangled QuNits
ENG Hong-Liang;FANG Xi-Ming
Department of Physics, Hunan Normal University, Changsha 410081
关键词 ：
03.67.Dd ,
03.65.Ud ,
89.70.+c
Abstract ： We propose an extension of quantum key distribution based on encoding the key into quNits, i.e. quantum states in an N-dimensional Hilbert space. In our protocol, we adopt asymmetric measurement scheme resulting in an efficiency higher than previous protocols and a generalized Bell inequality [Phys. Rev. Lett.92(2004)130404] is employed to detect the presence of an eavesdropper Eve. We also derive the information gained by a potential eavesdropper Eve applying a cloning-based attack and the maximal error rate which measures the robustness of the protocol. The result shows that the security of our scheme increases with the dimension N.
Key words ：
03.67.Dd
03.65.Ud
89.70.+c
出版日期: 2005-02-01
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2005, Vol. 22 
