Controlled Bidirectional Quantum Direct Communication by Using a GHZ State
Man Zhong-Xiao, Yun‐Jie Xia · Chinese Physics Letters · 2006
A controlled bidirectional quantum secret direct communication scheme is proposed by using a Greenberger–Horne–Zeilinger (GHZ) state. In the scheme, two users can exchange their secret messages simultaneously with a set of devices under the control of a third party. The security of the scheme is analysed and confirmed.