Guo-Qiang Huang

Controlled Dense Coding using Generalized GHZ-type State

Two schemes for controlled dense coding with a generalized GHZ-type state are investigated. In this protocol, the supervisor (Cliff) can control the channel and the average amount of information transmitted from the sender (Alice) to the receiver (Bob) by adjusting the local measurement angle θ. The results for the average amounts of information are unique from the different two schemes.

SPLITTING QUANTUM INFORMATION WITH FIVE-ATOM ENTANGLED STATE IN CAVITY QED

A realizable scheme is proposed for implementing quantum information splitting with five-atom entangled state in cavity QED, where we explicitly illustrate the procedure and analyze the security against the eavesdropping. The scheme does not involve Bell-state measurement and is insensitive to the cavity and the thermal field.