Abstract
It is presented that a bidirectional remote state preparation scheme uses six-qubit maximally entangled state. In this paper we propose a new protocol which allows two distant parties to simultaneously and deterministically exchange their states under controling of a third remote party. In such a way, it cannot be successful without permission of the controller. Based on the von Neumann measurement and Bell state measurement, Alice can transmit an arbitrary single qubit state to Bob, while Bob can transmit an arbitrary single qubit state to Alice via the control of the supervisor Charlie.
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