Economical and feasible controlled teleportation of an arbitrary unknownN-qubit entangled state
Zhong‐Xiao Man, Yun‐Jie Xia, Nguyen Ba An · Journal of Physics B Atomic Molecular and Optical Physics · 2007
We propose a new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under the control of M (M < N) controllers. In comparison with other existing protocols, ours is more economical and more feasible. The quantum resource required is just M Greenberger–Horne–Zeilinger trios plus (N − M) Einstein–Podolsky–Rosen pairs. The techniques required are only N Bell measurements by the sender, a von Neumann measurement by a controller and N single-qubit transformations by the receiver. The rule for the receiver to reconstruct the desired state is derived explicitly in the most general case.