Abstract
The aim of controlled quantum teleportation is to realize communication between Alice and Bob to cooperate with a trusted controller Charlie successfully. However, we show that the dishonest Bob can obtain the initial Alice's secret message with 50 percents without the permission of Charlie. We propose an improved controlled quantum teleportation scheme by using quantum entanglement swapping in quantum communication. The receiver Bob is identified by the trusted Charlie. After the sender Alice gets the feedback information from Charlie, he can make sure the identity of Bob and then sends the quantum information to Bob. The scheme can effectively prevent forged identity attack to ensure the security of quantum teleportation. We also propose a quantum teleportation scheme with identity authentication in controlled quantum network with multiple users and controllers.
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