利用Raman相互作用构造类可控非门

Construction of Like-Control-Not Gate with Raman Interaction

利用一个参量频率转换过程,在腔中制备双模SU(2)相干态,然后注入Λ型三能级原子,使之与腔场的一个模发生Raman相互作用,生成腔场-原子纠缠态,通过对原子进行选择性测量,可获得奇偶SU(2)相干态。我们分别将原子能级和奇偶相干态编者按码为目标量子比特和控制量子比特,利用Raman相互作用可构造出类可控非门。

First, two-modes SU(2) coherent state of the cavity is prepared by a parametric frequency Conversion process. Second, a Λ-type three-level atom is injected in the cavity, leading to the interaction of the atoms and the cavity. Then the atom-cavity-field entanglement is created by atom-field Raman interaction between the atoms and the cavity field, and through the selective measurement of the atoms, the atom-field states collapse into odd or even SU(2) coherence states. Therefore, we can encode respectively the atomic levels and the odd and even coherence states into goal and control quantum bits and thus construct deterministically the like-control-not gate by use of the Raman interaction between the atoms and the fields.