Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array
Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array
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DOI：
10.1103/physrevresearch.2.023086
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发表时间：
2019-09
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
我们展示了如何在一个二维阵列的冷原子的初始本地化的辐射激发可以转换成高定向相干光发射的光通过保护整个阵列的激发在subradiant集体本征模的寿命的数量级长于一个孤立的原子的传播。然后，通过控制原子的塞曼能级位移，可以从受保护的次辐射本征模中释放激发。因此，在所有方向上发射的原始定域激发被转移到离域亚辐射保护激发，光子的概率发射仅沿着垂直于原子平面的轴。这种受保护的扩散和定向发射可能被用于连接量子信息或量子计算架构中的各个阶段。
We show how an initial localized radiative excitation in a two-dimensional array of cold atoms can be converted into highly-directional coherent emission of light by protecting the spreading of the excitation across the array in a subradiant collective eigenmode with a lifetime orders of magnitude longer than that of an isolated atom. The excitation can then be released from the protected subradiant eigenmode by controlling the Zeeman level shifts of the atoms. Hence, an original localized excitation which emits in all directions is transferred to a delocalized subradiance-protected excitation, with a probabilistic emission of a photon only along the axis perpendicular to the plane of the atoms. This protected spreading and directional emission could potentially be used to link stages in a quantum information or quantum computing architecture.