.Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers[J].Optoelectronics Letters,2008,4(4): 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-Home-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. Hits: 3599 Download times: 165 View Full Text    Download reader