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Bright Electrically Contacted Circular Bragg Grating Resonators with Deterministically Integrated Quantum Dots
Setthanat Wijitpatima1, Normen Auler2, Priyabrata Mudi1
1Institute of Solid State Physics, Technische Universität Berlin, Hardenbergstraße 36, Berlin 10623, Germany.
ACS Nano
|November 5, 2024
Summary
We developed electrically controlled quantum dot-circular Bragg grating resonators for brighter quantum devices. These high-performance quantum light sources achieve excellent photon extraction efficiency and purity for quantum information systems.
Area of Science:
- Quantum Optics
- Materials Science
- Nanotechnology
Background:
- Semiconductor quantum dots (QDs) are crucial for quantum devices.
- Efficient light extraction from QDs is needed for quantum photonic applications.
- Electrical control of QDs enhances device functionality.
Purpose of the Study:
- To design and fabricate electrically controlled quantum dot-circular Bragg grating (QD-CBG) resonators.
- To improve photon extraction efficiency (PEE) and electro-optical properties of QD light sources.
- To enable advanced quantum photonic applications.
Main Methods:
- Combining circular Bragg grating (CBG) with PIN-diode structures.
- Numerical simulations for device parameter fine-tuning.
- Deterministic nanoprocessing for QD-CBG resonator fabrication.
Main Results:
- Achieved electrically controlled single QD-CBG resonators with tunable emission.
- Demonstrated a photon extraction efficiency (PEE) of up to 30.4(3.4)%, with potential for >50%.
- Obtained high single-photon purity (99.2(2)%) and photon indistinguishability (75(5)%).
Conclusions:
- Developed high-performance quantum light sources with cavity enhancement and electrical control.
- These QD-CBG resonators are promising for quantum information systems, including quantum repeaters.
- The study demonstrates significant progress in deterministic quantum device fabrication.
