Long-distance radiative excitation transfer between quantum dots in disordered photonic crystal waveguides

TL;DR

This paper theoretically studies photon-mediated excitation transfer between quantum dots in disordered photonic crystal waveguides, revealing how disorder affects transfer rates and demonstrating feasible long-range interactions in realistic systems.

Contribution

It provides a detailed analysis of disorder effects on excitation transfer and shows potential for long-distance quantum dot interactions in practical photonic structures.

Findings

Disorder causes light localization, drastically affecting transfer rates.

Transfer rates vary widely with disorder configurations.

Significant transfer rates (~50 μeV) at 10 μm range are achievable in realistic systems.

Abstract

We theoretically investigate the magnitude and range of the photon-mediated interaction between two quantum dots embedded in a photonic crystal waveguide, including fabrication disorder both in the crystal and in the dot positioning. We find that disorder-induced light localization has a drastic effect on the excitation transfer rate - as compared to an ideal structure - and that this rate varies widely among different disorder configurations. Nevertheless, we also find that significant rates of 50 micro-eV at a range of 10 micro-meters can be achieved in realistic systems.