Vanishing biexciton binding energy from stacked, MOVPE grown, site-controlled pyramidal quantum dots for twin photon generation

TL;DR

This paper reports on stacked double-pyramidal quantum dots with near-zero biexciton binding energy, enabling nearly identical twin photon emission, which is significant for quantum information and biological applications.

Contribution

It demonstrates the characterization and potential of stacked pyramidal quantum dots for twin photon generation with near-zero biexciton binding energy.

Findings

Biexciton binding energies close to zero observed

Sequential two-photon emission with nearly identical photon energies achieved

Potential applications in quantum information and quantum biology

Abstract

We characterized stacked double-pyramidal quantum dots which showed biexciton binding energies close to zero by means of photoluminescence and cross-correlation measurements. It was possible to obtain a sequence of two photons with (nearly) the same energy from the biexciton-exciton-ground state cascade, as corroborated by a basic rate-equation model. This type of two-photon emission is both of relevance for fundamental quantum information theory studies as well as for more exotic applicative fields such as quantum biology.