利用三原子W类纠缠态在腔量子电动力学体系中实现单原子态的远程制备

提出了两个利用三原子W类纠缠态作为量子通道.在腔量子电动力学(QED)体系中实现单原子态的远程制备方案:一个是接收者借助于原子与单模腔场之间的大失谐相互作用实现初始态重建,另一个则是接受者利用原子与单模腔场之间的共振相互作用完成远程态制备.两方案中都涉及到了一位发送者和两位接收者,发送者可以将被传送态远程制备到两位接收者中的任何一位的手中,而另一位接受者必须为其提供必要的协助.表明利用原子与腔场之间的大失谐相互作用的方法可以很好地克服腔场的消相干,降低对腔品质因子的要求;而利用共振相互作用的方法则无需引入辅助原子,操作简便.但不论采用何种方法,实现单原子远程态制备的总成功概率是相同的.

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.