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We present a controlled quantum teleportation protocol. In the protocol,quantum information of an unknown state of a 2-level particle is faithfullytransmitted from a sender (Alice) to a remote receiver (Bob) via an initiallyshared triplet of entangled particles under the control of the supervisorCharlie. The distributed entangled particles shared by Alice, Bob and Charliefunction as a quantum information channel for faithful transmission. We alsopropose a controlled and secure direct communication scheme by means of thisteleportation. After insuring the security of the quantum channel, Aliceencodes the secret message directly on a sequence of particle states andtransmits them to Bob supervised by Charlie using this controlled quantumteleportation. Bob can read out the encoded message directly by the measurementon his qubit. In this scheme, the controlled quantum teleportation transmitsAlice's message without revealing any information to a potential eavesdropper.Because there is not a transmission of the qubit carrying the secret messagebetween Alice and Bob in the public channel, it is completely secure forcontrolled and direct secret communication if perfect quantum channel is used.The feature of this scheme is that the communication between two sides dependson the agreement of the third side.Comment: 4 page

Controlled quantum teleportation and secure direct communication