.Teleportation of an arbitrary unknown N -qubit entangled state under the controlling of M controllers[J].Optoelectronics Letters,2008,4(4):283-286 Teleportation of an arbitrary unknown N -qubit entangled state under the controlling of M controllers Abstract:       A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Horne-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it. The work is supported by the National Natural Science Foundation of China (Grant No. 10534030). Hits: 3503 Download times: 222 View Full Text    Download reader