Nonradiant multiphoton states in quantum ring oligomers

TL;DR

This paper introduces a universal mechanism to significantly extend the lifetime of multiphoton states in quantum ring ensembles by external coupling via the radiation continuum, with potential applications across various open quantum systems.

Contribution

It proposes a novel external coupling method to enhance the lifetime of multiphoton states in quantum ring structures, demonstrating its effectiveness through optimized geometry.

Findings

Lifetime of excited states increased by several orders of magnitude.

Optimization of structure geometry enhances state longevity.

Universal applicability to different quantum systems.

Abstract

Arrays of coupled dipole emitters support collective single- and multiphoton states that can preserve quantum excitations. One of the crucial characteristics of these states is the lifetime, which is fundamentally limited due to spontaneous emission. Here, we present a mechanism of the external coupling of two states via the radiation continuum, which allows for an increase in the lifetime of both single and double excitations. As an illustrative example, we consider a ringlike ensemble of quantum emitters, demonstrating that upon slight optimization of the structure geometry, one can increase the lifetime of singly and doubly excited states with nonzero orbital momentum by several orders of magnitude. The proposed mechanism of multiphoton excitation lifetime control has a universal nature and might be applied to a wide class of open quantum systems and quantum ensembles besides the particular geometry considered in this paper.