论文标题
通过无序和嘈杂的旋转链几乎完美地传播多方纠缠
Almost perfect transmission of multipartite entanglement through disordered and noisy spin chains
论文作者
论文摘要
我们展示了如何有效地沿任意大小的自旋链有效地发送m-partite纠缠状态。具体而言，我们展示了如何几乎可以完美地从一端（Alice）到另一端（bob）的Spin-1/2链的另一端（BOB）纠缠的M-Partite W Sate，该链条略微修饰了XX模型。我们在不使用外部磁场或调节链自旋之间的耦合常数的情况下实现了几乎完美的变速箱，这是实现良好传输效率的两种标准方法。此外，这里提出的协议可用于将带有爱丽丝的M-Partite W状态转化为具有BOB的M'-Partite（与M'不同）。我们还研究了提出的方案对几种类型的疾病和噪声的响应，并表明，关于最佳有序且无噪声案例的耦合常数的小偏差非常稳定。
We show how to efficiently send an M-partite entangled state along a spin chain of arbitrary size. Specifically, we show how an entangled M-partite W sate can be almost flawlessly transmitted from one end (Alice) to the other end (Bob) of a spin-1/2 chain described by a slightly modified XX model. We achieve an almost perfect transmission without employing external magnetic fields or modulating the coupling constants among the spins of the chain, the two standard approaches used to achieve a good transmission efficiency. Moreover, the protocol here proposed can be used to transform an M-partite W state with Alice into an M'-partite one with Bob (M different from M'). We also investigate the proposed protocol's response to several types of disorder and noise and show that it is quite robust to small deviations about the coupling constants of the optimal ordered and noiseless case.
