Abstract:

The characteristic of W state is introduced. The coefficients of W state used for quantum key distribution and secret sharing are proved to be uniform in symmetrical form. The corresponding quantum key distribution scheme via W state is proposed. To insure the security of the proposed quantum key distribution protocol, the receiver chooses randomly the message mode or control mode asymmetrically. And the security of the schemes is discussed. Quantum secret sharing scheme is accordingly proposed. And the security of the schemes is also discussed. Compared with the quantum key distribution and secret sharing schemes with Greenberger-Horne-Zeilinger(GHZ) states, the efficiency of the proposed schemes is low. The purpose of this paper is just to prove that the states except for GHZ states can be used for quantum key distribution and secret sharing.

Key words: Quantum Key Distribution, Quantum Secret Sharing, W state