论文标题
纠缠净化的复发方案中的最佳两倍闸门
Optimal two-qubit gates in recurrence protocols of entanglement purification
论文作者
论文摘要
我们建议并研究一种优化复发纠缠纯化协议的方法。该方法基于借助准Newton算法的整个SU（4）矩阵中的数值搜索。我们的方法评估了平均并发，其中还考虑了混合纠缠状态的概率发生。我们向某些国家的家庭表明，最佳协议不一定是通过双侧应用的不受控制的门来实现的。当我们发现几种最佳解决方案时，提出的方法在纠缠纯化协议的实验实现和量子信息处理中有趣的观点方面提供了一些灵活性。
We propose and investigate a method to optimize recurrence entanglement purification protocols. The approach is based on a numerical search in the whole set of SU(4) matrices with the aid of a quasi-Newton algorithm. Our method evaluates average concurrences where the probabilistic occurrence of mixed entangled states is also taken into account. We show for certain families of states that optimal protocols are not necessarily achieved by bilaterally applied controlled-NOT gates. As we discover several optimal solutions, the proposed method offers some flexibility in experimental implementations of entanglement purification protocols and interesting perspectives in quantum information processing.
