In a recent paper [Z. J. Zhang and Z. X. Man, Phys. Rev. A 72, 022303 (2005)], a multiparty quantum secret sharing protocol based on entanglement swapping was presented. However, as we show, this protocol is insecure in the sense that an unauthorized agent group can recover the secret from the dealer. Hence we propose an improved version of this protocol which can stand against this kind of attack.
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机译：在最近的一篇论文中[Z. J.Zhang和Z.X.Man，Phys。 Rev. A 72，022303（2005）]，提出了一种基于纠缠交换的多方量子秘密共享协议。但是，正如我们所展示的，从未经授权的代理组可以从经销商处获取秘密的意义上来说，该协议是不安全的。因此，我们提出了该协议的改进版本，可以抵御这种攻击。
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