Remote preparation of qubit via tripartite entangled W state in cavity QED

Two schemes of remotely preparing an atomic state by using a tripartite entangled W state as the quantum channel in cavity QED are proposed. One is that the receiver reconstructs the original state based on the large-detuned interaction of a cavity field with two atoms, and the other is based on the resonant interaction between a cavity and an atom. The two schemes involve one sender and two remote receivers, and the sender can help either one of the two receivers remotely reconstruct the original state with the assistance of the other receiver's single-particle orthogonal measurement. It shows that the scheme based on large-detuned interaction between atoms and cavity is insensitive to the decoherence of the cavity field, and thus the requirement on the Q factor of the cavity decreases. While in the other one based on resonant interaction betweenan atom and cavity, it is not necessary to introduce an auxiliary atom, so that the operations are more simple and convenient. But no matter which method is adopted, the total success probabilities of the both processes are equal.