Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array

Ballantine, Kyle and Ruostekoski, Janne (2020) Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array. Physical Review Research, 2 (2). ISSN 2643-1564

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Abstract

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. We demonstrate how to reach two such strongly subradiant modes, a uniform one where all the dipoles are oscillating in phase normal to the plane and an antiferromagnetic mode where each dipole is π out of phase with its nearest neighbor. The excitation, which can consist of a single photon, is then 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.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review Research
ID Code:
143622
Deposited By:
Deposited On:
28 Apr 2020 10:45
Refereed?:
Yes
Published?:
Published
Last Modified:
26 Sep 2020 06:30