We propose a two-party quantum private comparison protocol using single photons, in which two distrustful parties can compare whether their secrets are equal with the help of a third party (TP). Any information about the values of their respective secrets will not be leaked out even with a compromised TP. Security is also discussed.

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A quantum secure direct communication protocol with cluster states is proposed. Compared with the deterministic secure quantum communication protocol with the cluster state proposed by Yuan and Song (Int. J. Quant. Inform., 2009, 7: 689), this protocol can achieve higher intrinsic efficiency by using two-step transmission. The implementation of this protocol is also discussed. quantum secure direct communication, deterministic secure quantum communication, cluster state