通过部分坍缩测量提高二叉树自旋网络中的量子态转移效率
Enhancing quantum state transfer efficiency in binary-tree spin networks by partially collapsing measurements
摘要：
利用部分坍缩测量的优点，研究了二叉树自旋网络上的量子态转移。为此，我们首先对二叉树网络的中心量子比特进行弱测量（WM），并在整个系统的时间演化之后，对目标量子比特进行量子测量反转（QMR）。通过取QMR的最佳值，表明通过控制WM强度可以显著改善QST，并且通过选择它足够接近于1，可以实现接近完美的QST。我们还表明，如何在二叉树自旋网络的纠缠分布质量可以明显改善使用这种方法。
英文摘要：
In this work, quantum state transfer (QST) over binary-tree spin networks is studied by using advantages of partially collapsing measurements. To this aim, we perform initially a weak measurement (WM) on central qubit of the binary-tree network, which encoding the state of concern and after time evolution of the whole system, a quantum measurement reversal (QMR) on the destined qubit is performed. By taking the optimal value of the QMR, it is shown that the QST can be improved considerably by controlling the WM strength and by choosing it close enough to 1, near-perfect QST can be achieved. We also show that how entanglement distribution quality over the binary-tree spin network can be obviously improved by using this approach.
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