Curator's Take
AI Commentary
This article shows how subradiant excitations in ring‑shaped atomic arrays can be trapped, moved adiabatically and made to interact, providing a dissipation‑protected way to store and process photonic qubits. By leveraging recent experimental progress with tweezer‑assembled subwavelength atom lattices, the work extends earlier demonstrations of collective light–matter coupling into concrete protocols for coherent transport and conditional phase gates—key ingredients for scalable quantum networking. While still theoretical, the proposed geometry‑controlled selectivity offers a realistic pathway to low‑loss quantum memories that could complement solid‑state and superconducting platforms.
— Mark Eatherly
Summary
Collective excitations in ordered subwavelength atomic arrays can exhibit strongly suppressed radiative decay due to interference between light scattered by neighboring emitters. These so-called subradiant states make these systems a promising platform for storing and manipulating photonic excitations. The external geometry of the array, combined with dynamical control of the atomic dipole orientation, enables localized trapping and coherent transport of these subradiant excitations. Here, we theoretically demonstrate these capabilities in ring-shaped atomic arrays. Specifically, we show adiabatic transport of a localized excitation around a single ring, coherent transfer of a single excitation between two neighboring rings with geometry-controlled selectivity, and interaction-induced conditional phase shifts between two simultaneously trapped excitations in neighboring rings. The latter can be interpreted as effective controlled-phase operations between stored excitations. Together, these results demonstrate the potential of ordered atomic arrays as a platform for coherent photonic quantum information processing with dissipation-protected collective excitations.