Abstract
We investigate the quantum confinement effects on excitons in several types of strain-free GaAs/AlGaAs droplet epitaxy (DE) quantum dots (QDs). By performing comparative analyses of energy-dispersive X-ray spectroscopy with the aid of a three-dimensional (3D) envelope-function model, we elucidate the individual quantum confinement characteristics of the QD band structures with respect to their composition profiles and the asymmetries of their geometrical shapes. By precisely controlling the exciton oscillator strength in strain-free QDs, we envisage the possibility of tailoring light-matter interactions to implement fully integrated quantum photonics based on QD single-photon sources (SPSs).
Highlights
Photons appear to be ideal resources for implementing quantum bits in long-distance quantum communication and information processing [1]
Strain-free droplet epitaxy (DE) quantum dots (QDs) can be implemented on an optical chip containing controlled shapes and sizes [4,10,12,14,20,21], thereby serving as high-fidelity sources of entangled photons [4,5,22,23]
As the entanglement fidelity relies on the minuscule energy splitting of fine-structure, corresponding quantum confinement corrections on QD band structures can substantially vitiate the quality of entanglement
Summary
Photons appear to be ideal resources for implementing quantum bits (or qubits) in long-distance quantum communication and information processing [1]. Strain-free DE QDs can be implemented on an optical chip containing controlled shapes and sizes [4,10,12,14,20,21], thereby serving as high-fidelity sources of entangled photons [4,5,22,23]. Atomic scale analyses have confirmed a low degree of Al defects in two-dimensional (2D) [11,25] and 3D composition profiles [13]. These Al remnants modify the electronic and phononic band structures of the GaAs DE QDs, degrading the fidelity of the entangled photons. As the entanglement fidelity relies on the minuscule energy splitting of fine-structure, corresponding quantum confinement corrections on QD band structures can substantially vitiate the quality of entanglement
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