In this work, we study optimal transfer of quantum states via spin chains. We develop the protocol for structural restoring of multi-quantum coherence matrices of multi-qubit quantum states transferred from sender to receiver along a spin-1/2 chain. We also develop a protocol for constructing such 0-order coherence matrix that can be perfectly transferred in this process. The restoring protocol is based on the specially constructed unitary transformation applied to the state of the extended receiver. This transformation for a given length of the chain and Hamiltonian is universally optimal in the sense that ones constructed it can be applied to optimally restore any higher-order coherence matrices.

在这项工作中，我们通过自旋链研究了量子态的最佳转移。我们开发了用于沿自旋 1/2 链从发送器传输到接收器的多量子位量子态的多量子相干矩阵的结构恢复协议。我们还开发了一个协议来构建这种可以在这个过程中完美转移的 0 阶相干矩阵。恢复协议基于应用于扩展接收器状态的特殊构造的酉变换。对于给定长度的链和哈密顿量，这种变换是普遍最优的，因为构造它的人可以应用于最佳地恢复任何高阶相干矩阵。