A new multi-party quantum private comparison based on n-dimensional n-particle GHZ state

Abstract

With the help of a semi-honest third party Calvin, n parties [Formula: see text] can determine whether all of their private inputs [Formula: see text] are equal or not without leaking any information. In this paper, we present a novel protocol using special quantum unitary operations and n-dimensional n-particle GHZ states. The proposed protocol is correct. It can also resist various outside attacks and overcome the problem of information leakage.