Abstract
We consider a set of quantum channels which are though partially entangled but can perform perfectly quantum teleportation of two-qubit states with the assistance of a controller. The quantum channels are designed so that only the controller is able to correctly control the task and without his/her cooperation the receiver cannot obtain with certainty a state with quality better than that obtained classically. The key point enhancing the role of the controller is that he/she is the only one who is allowed to know the quantum channel parameters.
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