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| A Scheme for Quantum Key Distribution Between Any Two Users in a Network via W State |
| Tao Yuan Pan Wei Luo Bin Li Feng |
| Optical Communication and Devices Research Laboratory, Southwest Jiaotong University, Chengdu 610031, China |
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Abstract Considering the problem of key distribute between any two users in a network, we transform the coefficients of W state to be uniform in symmetrical form. A scheme for quantum key distribution in a network via W state is proposed. Certificate Authority (CA) and the two users who want to communicate with each other share the three particles of W state. CA performs a measurement on his own particle and promulgates the result of his measurement, two users create their key in corresponding ways according to the measurement result of CA. Then the security of the situation that exists an eavesdropper (Eve) or CA is unauthentic is discussed respectively. It is proved that this scheme can withstand the attack effectively, and carry out the academic efficiency that three W states can be used to gain two bits key.
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Received: 23 April 2007
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Corresponding Authors:
Tao Yuan
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2008, Vol. 30 
