Controlled quantum teleportation and secure direct communication
Gao Ting (高亭)abd, Yan Feng-Li (闫凤利)cd, Wang Zhi-Xi (王志玺)b
a College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050016, Chinab Department of Mathematics, Capital Normal University, Beijing 100037, Chinac College of Physics, Hebei Normal University, Shijiazhuang 050016, China; d CCAST (World Laboratory), Beijing 100080, 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.
Received: 30 August 2004
Revised: 13 November 2004
Accepted manuscript online:
PACS:
0365
Fund: 国家自然科学基金资助（10271081）
Cite this article:
Gao Ting (高亭), Yan Feng-Li (闫凤利), Wang Zhi-Xi (王志玺) Controlled quantum teleportation and secure direct communication 2005 Chinese Physics 14 893
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
