CONTROLLED DENSE CODING WITH EXTENDED GHZ STATE
Guoqiang Huang, Cui-Lan Luo · International Journal of Quantum Information · 2009
Two schemes for controlled dense coding with a extended GHZ state are investigated. In these protocols, the supervisor (Cliff) can control the average amount of information transmitted from the sender (Alice) to the receiver (Bob) only by adjusting his local measurement angle θ. It is shown that the results for the average amounts of information are unique from the different two schemes.