Towards scalable entangled photon sources with self-assembled InAs/GaAs quantum dots

TL;DR

This paper proposes a wavelength-tunable entangled photon source using self-assembled InAs/GaAs quantum dots with independently tunable FSS and exciton energy, advancing towards scalable quantum communication devices.

Contribution

It introduces a novel three-dimensional stressor method enabling independent tuning of FSS and exciton energy in quantum dots, facilitating scalable entangled photon sources.

Findings

Wavelength tunability of entangled photon emission demonstrated

Independent control of FSS and exciton energy confirmed by calculations

First step towards scalable quantum dot-based entangled photon generators

Abstract

Biexciton cascade process in self-assembled quantum dots (QDs) provides an ideal system for deterministic entangled photon pair source, which is essential in quantum information science. The entangled photon pairs have recently be realized in experiments after eliminating the FSS of exciton using a number of different methods. However, so far the QDs entangled photon sources are not scalable, because the wavelengths of the QDs are different from dot to dot. Here we propose a wavelength tunable entangled photon emitter on a three dimensional stressor, in which the FSS and exciton energy can be tuned independently, allowing photon entanglement between dissimilar QDs. We confirm these results by using atomistic pseudopotential calculations. This provides a first step towards future realization of scalable entangled photon generators for quantum information applications.