自旋孤子与自旋链动力学的量子控制
Spin Solitons and Quantum Control of Spin Chain Dynamics
摘要：
相干光谱学的实验对应于量子力学系综的控制，通过幺正变换将它们从初始状态引导到最终目标状态。完成这些酉变换的控制输入（脉冲序列）应花费尽可能少的时间，以使弛豫效应最小化并优化实验的灵敏度。在这里，我们提出了一个完全不同的和普遍适用的方法来有效地控制任意长度的自旋链的动态。这种方法依赖于局部自旋波的产生，“自旋孤子”，以及这些孤子状态通过自旋链的有效传播。所提出的方法有望在相干光谱学和量子信息处理中的自旋动力学控制中找到直接的应用。
英文摘要：
Experiments in coherent spectroscopy correspond to control of quantum mechanical ensembles guiding them from initial to final target states by unitary transformations. The control inputs (pulse sequences) that accomplish these unitary transformations should take as little time as possible so as to minimize the effects of relaxation and to optimize the sensitivity of the experiments. Here, we present a radically different and generally applicable approach to efficient control of dynamics in spin chains of arbitrary length. The approach relies on the creation of localized spin waves, ``spin solitons'', and efficient propagation of these soliton states through the spin chain. The methods presented are expected to find immediate applications in control of spin dynamics in coherent spectroscopy and quantum information processing.
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