Enhanced multiparty quantum secret sharing of classical messages based on entanglement swapping

Based on the multiparty quantum secret sharing protocol [Z. J. Zhang and Z. X. Man, Phys. Rev. A 72, 022303 (2005)] , we proposed two schemes to enhance the transmission efficiency of whole protocol. In our improved version of the Zhang-Man protocol which the dealer can transmit double amount of secret messages at a time securely instead of doing the Zhang-Man protocol twice. Besides, we save a lot of cost of whole quantum secret sharing system. When the amount of secret messages is large and the number of agents is more, the performance of our schemes is much better than the ZhangMan protocol.