We present a way to teleport multiqubit quantum information from a sender to a distant receiver via the control of many agents in a network. We show that the original state of each qubit can be restored by the receiver as long as all the agents collaborate. However, even if one agent does not cooperate, the receiver cannot fully recover the original state of each qubit. The method operates essentially through entangling quantum information during teleportation, in such a way that the required auxiliary qubit resources, local operation, and classical communication are considerably reduced for the present purpose.
This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevA.70.022329.
Yang, Chui-Ping., Chu, Shih-I., Han, Siyuan. "Efficient many-party controlled teleportation of multiqubit quantum information via entanglement." Phys. Rev. A 70, 022329 – Published 30 August 2004. http://dx.doi.org/10.1103/PhysRevA.70.022329.