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Chin. Phys., 2005, Vol. 14(5): 893-897    DOI: 10.1088/1009-1963/14/5/006
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Controlled quantum teleportation and secure direct communication

Gao Tinga, Yan Feng-Lib, Wang Zhi-Xic
a College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050016, China;Department of Mathematics, Capital Normal University, Beijing 100037, China;World Laboratory), P.O. Box 8730, Beijing 100080, China; b College of Physics, Hebei Normal University, Shijiazhuang 050016, China;World Laboratory), P.O. Box 8730, Beijing 100080, China; c Department of Mathematics, Capital Normal University, Beijing 100037, China
Abstract  We present a controlled quantum teleportation protocol. In the protocol, quantum information of an unknown state of a 2-level particle is faithfully transmitted from a sender (Alice) to a remote receiver (Bob) via an initially shared triplet of entangled particles under the control of the supervisor Charlie. The distributed entangled particles shared by Alice, Bob and Charlie function as a quantum information channel for faithful transmission. We also propose a controlled and secure direct communication scheme by means of this teleportation. After ensuring the security of the quantum channel, Alice encodes the secret message directly on a sequence of particle states and transmits them to Bob supervised by Charlie using this controlled quantum teleportation. Bob can read out the encoded message directly by the measurement on his qubit. In this scheme, the controlled quantum teleportation transmits Alice’s message without revealing any information to a potential eavesdropper. Because there is not a transmission of the qubit carrying the secret message between Alice and Bob in the public channel, it is completely secure for controlled and direct secret communication if perfect quantum channel is used. The feature of this scheme is that the communication between two sides depends on the agreement of the third side.
Keywords:  measurement      controlled quantum teleportation      secure direct communication  
Received:  30 August 2004      Revised:  13 November 2004      Published:  19 May 2005
PACS:  0365  
Fund: 国家自然科学基金资助(10271081)

Cite this article: 

Gao Ting, Yan Feng-Li, Wang Zhi-Xi Controlled quantum teleportation and secure direct communication 2005 Chin. Phys. 14 893

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