二叉树自旋网络中的高保真态转移
High fidelity state transfer in binary tree spin networks
摘要：
在量子自旋网络的背景下，研究了量子态在二叉树结构上的传播。对于二阶二叉树，提出了一种简单的协议，它允许实现任意高的传输保真度。它不需要微调的本地字段和两个节点耦合的中间自旋。相反，它假设在预期的接收节点上进行简单的本地操作：它们的作用是破坏网络的横向对称性，从而引起传播信号的有效重新聚焦。讨论了如何将这些效应推广到任意阶二叉树的一些想法。
英文摘要：
Quantum state propagation over binary tree configurations is studied in the context of quantum spin networks. For binary tree of order two a simple protocol is presented which allows to achieve arbitrary high transfer fidelity. It does not require fine tuning of local fields and two-nodes coupling of the intermediate spins. Instead it assumes simple local operations on the intended receiving node: their role is to brake the transverse symmetry of the network that induces an effective refocusing of the propagating signals. Some ideas on how to scale up these effect to binary tree of arbitrary order are discussed.
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