Coherent Spin Dynamics in 2D Arrays of Rydberg Atoms

这个项目的目标是为里德堡多体物理建立一个新的范例。它的优势来自于我们基于单原子的多体Rydberg体系结构的独特功能，这是迄今为止在其他实现中没有的：我们将基于具有单站点寻址能力的偶极陷阱阵列，在可重新配置的2D和分层3D几何图形中精确定义的位置放置多达数百个单个Rydberg原子的定义良好的集合。阵列中的单个原子可以通过光学双光子跃迁被激发到里德堡态。同时，通过结合施加微波场和寻址光场，可以访问其他里德堡态。这个独特的平台将使我们能够利用同一里德堡态原子之间的范德华类型相互作用，以及两个不同里德堡态原子之间的共振偶极相互作用。对三维几何结构、相互作用参数和原子数的完全控制使我们能够利用伊辛型相互作用(范德华相互作用)和XY型相互作用(偶极相互作用)来设计有效的自旋1/2哈密顿量。在系统的时间演化过程中，我们保持了对原子内部和外部状态的高度控制，这使我们能够对量子多体系统的动力学行为有新的认识。

This project is aiming towards establishing a new paradigm forRydberg many-body physics. It draws its strength from the uniquefeatures of our single-atom based many-body Rydberg architecture,which has not been available in other implementations so far: We willplace well defined sets of up to a few hundred single rubidium atomsat exactly defined locations in re-configurable 2D and layered 3Dgeometries, based on dipole trap arrays with single-siteaddressability. Individual atoms in the array can be excited to aRydberg state by an optical two-photon transition. Simultaneously,other Rydberg states are accessible by applying a microwave field incombination with an addressing light field. This unique platform willenable us to exploit van-der-Waals type interactions between atoms inthe same Rydberg state as well as resonant dipolar interactionsbetween atoms in two different Rydberg states. Full control of thegeometry in up to three dimensions, interaction parameters, and atomnumber allows us to engineer effective spin-1/2 Hamiltonians withIsing-type interactions (van der Waals) and XY-type interactions(dipolar). During the temporal evolution of the system we maintain ahigh level of control of the internal and external states of the atoms.This enables us to gain novel insight in the dynamical behavior of thequantum many-body system.