沿XY自旋链传递的量子态恢复与纠缠演化

我们提出了一种恢复沿由XY哈密顿量控制的自旋链上传递状态的协议。这种动力学不保守激发数，导致多个量子相干矩阵混合，其阶数具有相同的奇偶性。 Depending on the initial state, this results in generating ether all possible or only even-order multiple-quantum coherence matrices. Restoring is established via the special unitary transformation applied to the receiver side of the chain (extended receiver). An example of restoring $\pm1$ and $\pm 2$-order coherence matrices in two-qubit state transfer is considered. Entanglement transfer in such process is also studied and possibility of its amplification is demonstrated.