Unidirectional absorption, storage, and emission of single photons in a collectively responding bilayer atomic array
Unidirectional absorption, storage, and emission of single photons in a collectively responding bilayer atomic array
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DOI：
10.1103/physrevresearch.4.033200
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发表时间：
2021-12
影响因子：
4.2
通讯作者：
K. Ballantine;J. Ruostekoski
中科院分区：
文献类型：
--
作者：
K. Ballantine;J. Ruostekoski
二维规则原子阵列是量子网络的一个有前途的平台，集体亚辐射态提供长寿命的存储和准直发射，允许自由空间中阵列之间的自然相干连接。然而，单层晶格只能在向前和向后方向上对称地有效地吸收或发射光。在这里，我们展示了双层晶格如何吸收单个光子，无论是从一个单一的方向入射或任意叠加的向前和向后传播的组件。激发可以存储在一个subradiant状态，在不同的subradiant状态之间的相干转移，并释放，再次在一个任意组合的高度准直的前向和后向传播组件。我们解释的方向性的单层和双层阵列的对称性分析的基础上不同的多极辐射组件的集体激发的散射宇称。集体模式可能会表现出传统的半波损失的领域附近的阵列接口或完全eliminatedit.The建议的方向控制的吸收和发射铺平了道路，多个阵列之间的有效的一维量子通信，与单光子传播之间的量子信息处理和存储阶段。
Two-dimensional regular arrays of atoms are a promising platform for quantum networks, with collective subradiant states providing long-lived storage and collimated emission allowing for natural coherent links between arrays in free space. However, a single-layer lattice can only efficiently absorb or emit light symmetrically in the forward and backward directions. Here we show how a bilayer lattice can absorb a single photon either incident from a single direction or an arbitrary superposition of forward and backward propagating components. The excitation can be stored in a subradiant state, transferred coherently between different subradiant states, and released, again in an arbitrary combination of highly collimated forward and backward propagating components. We explain the directionality of single and bilayer arrays by a symmetry analysis based on the scattering parities of different multipole radiation components of collective excitations. The collective modes may exhibit the conventional half-wave loss of fields near the array interface or completely eliminate it. The proposed directional control of absorption and emission paves the way for effective one-dimensional quantum communication between multiple arrays, with single-photons propagating backward and forward between quantum information-processing and storage stages.