Controlled Bidirectional Quantum Direct Communication by Using a GHZ State

2006 ◽  
Vol 23 (7) ◽  
pp. 1680-1682 ◽  
Author(s):  
Man Zhong-Xiao ◽  
Xia Yun-Jie
Keyword(s):  
Ghz State ◽  
Direct Communication ◽  
Quantum Direct Communication

Two Way Quantum Direct Communication Protocol Using Entanglement Swapping

2010 ◽  
Vol 56 (6) ◽  
pp. 1733-1737 ◽  
Author(s):  
Hyung Jin Yang ◽  
Chang Ho Hong ◽  
Jong In Lim ◽  
Ji In Kim
Keyword(s):  
Communication Protocol ◽  
Entanglement Swapping ◽  
Direct Communication ◽  
Quantum Direct Communication

scholarly journals Controlled and Secure Direct Communication Using GHZ State and Teleportation

2004 ◽  
Vol 59 (9) ◽  
pp. 597-601 ◽  
Author(s):  
T. Gao
Keyword(s):  
Quantum Channel ◽  
Quantum Teleportation ◽  
Ghz State ◽  
Secret Message ◽  
Controlled Quantum Teleportation ◽  
Direct Communication ◽  
The Public ◽  
Theoretical Scheme ◽  
Secret Communication ◽  
Two Sides

A theoretical scheme for controlled and secure direct communication is proposed. The communication is based on GHZ state and controlled quantum teleportation. After insuring the security of the quantum channel (a set of qubits in the GHZ state), Alice encodes the secret message directly on a sequence of particle states in the GHZ state and transmits them to Bob, supervised by Charlie using controlled quantum teleportation. Bob can read out the encoded messages directly by the measurement on his qubits. 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 messages between Alice and Bob in the public channel, it is completely secure for controlled and direct secret communication if a perfect quantum channel is used. The feature of this scheme is that the communication between two sides depends on the agreement of a third side.

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