Controlled Quantum Teleportation via Four Particle Asymmetric Entangled State

A general scheme for controlled teleportation of an arbitrary single-qubit state with four-qubit asymmetric state is proposed. In this scheme, the sender performs Bell measurement on his particle, the two controllers and the receiver perform joint unitary operation on the rest particles. Finally, the receiver can reconstruct the single particle by introducing an auxiliary particle, he first does unitary transformation on his particle and the auxiliary particle, then performs a Von Neumann measurement on the auxiliary particle. Thus the scheme can be realized in certain probability.