DENG Xiaoran, YANG Shuai, YAN Fengli. Quantum Secret Sharing with NParticle Entangled State[J]. Acta Photonica Sinica, 2010, 39(11): 2083
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In order to construct quantum secret sharing protocols among many parts,a Nparticle entangled state that has a large persistency of entanglement is introduced,and a quantum secret sharing protocol between one party and (N-1) parties is presented using the proposed entangled state.During constructing secret sharing,Alice chooses randomly unitary operation I or σx for the sent particles,and chooses a part of the particles to check the safeness of channel; then Alice chooses another part of the particles to check the honesty of partners and the safeness of channel by the operations of (N-1) parties.The protocol carries on examination to the eavesdropper for many times,so that it can insure the safeness of channel and the usability of the secret strings.Finally,there are n[1-(N-1)/2 N-1]/6 sharing secret bits among Alice and (N-1)parties.