Abstract
Control power is a newly presented indicator which reflects the measurable authority from the controller’s point of view. In this article, four controlled quantum teleportation schemes via four-particle cluster state are introduced. We calculate and discuss the control power of four controlled quantum teleportation schemes under different particle’s distribution. After computing the four scheme’s control power respectively, we find the value of control power in each scheme is equal, which is not only the minimal value of control power but no more than the classical bound. It’s evidently that the four-particle cluster state has the trait of symmetry.
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