原子链中的相干控制：捕获和释放运动激发
Coherent control in atomic chains: to trap and release a traveling excitation
摘要：
介绍了一种在由亚波长晶格常数的多能级原子有序阵列组成的原子链中进行动态色散工程的方案。这条链支持暗态，这些暗态被保护免受光子发射形式的耗散，并且可以被理解为沿着阵列传播的自旋波。通过使用具有空间变化的椭圆偏振的外部控制场，我们以可控的方式关联阵列的内部和外部自由度。对原子态的相干控制转化为对自旋波群速度的控制。通过动态改变控制场的幅值，可以在不耗散的情况下存储和释放行波激励。该协议是更传统的电磁感应透明的替代方案，并阐明了相干控制和相关衰变之间相互作用所产生的丰富物理学。
英文摘要：
We introduce a protocol for dynamical dispersion engineering in an atomic chain consisting of an ordered array of multi-level atoms with subwavelength lattice constant. This chain supports dark states that are protected from dissipation in the form of photon emission and can be understood as propagating spin waves traveling along the array. By using an external control field with a spatially-varying elliptical polarization we correlate internal and external degrees of freedom of the array in a controllable way. The coherent control over the atomic states translates into control over the group velocity of the spin waves. A traveling excitation can be stored and released without dissipation by adiabatically changing the control field amplitude. This protocol is an alternative to the more conventional electromagnetically-induced transparency, and exemplifies the rich physics born of the interplay between coherent control and correlated decay.
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