Collective spontaneous emission from pairs of quantum dots: long-range vs. short-range couplings

TL;DR

This paper investigates how pairs of quantum dots emit light collectively, comparing long-range radiative coupling and short-range tunnel coupling, revealing that both can produce similar emission behaviors despite different physical mechanisms.

Contribution

It provides a comparative analysis of collective emission in quantum dots for different coupling types, highlighting their potential equivalence in emission characteristics.

Findings

Long-range and short-range couplings can produce similar collective emission effects.

No qualitative difference in emission behavior between radiative and tunnel couplings.

Insights into quantum dot interactions for quantum information applications.

Abstract

We study the spontaneous emission from a coherently delocalized exciton state in a double quantum dot as a function of the distance between the dots, focusing on the similarities and differences between the cases of radiative (long-range, dipole) and tunnel coupling between the excitons in the dots. We show that there may be no qualitative difference between the collective emission induced by these two coupling types in spite of their essentially different physical properties.