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Bottom-up Single Quantum Dots in Microring Resonators for On-Chip Integrated Single Emitters
Xiaoying Huang1, Jake Horder2, Karin Yamamura2
1Australian Research Council Centre of Excellence for Transformative Meta-Optical Systems, Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, ACT 2600, Australia.
Nano Letters
|April 7, 2025
Summary
Researchers developed a deterministic method to grow single quantum dots in microring resonators for scalable on-chip quantum photonics. This breakthrough enables efficient single-photon emission, advancing quantum information processing.
Area of Science:
- Quantum Photonics
- Materials Science
- Nanotechnology
Background:
- On-chip quantum photonic integrated circuits are essential for quantum technologies.
- Current fabrication methods for quantum dots in these circuits are nondeterministic, hindering scalability and repeatability.
Purpose of the Study:
- To develop a scalable and repeatable method for integrating single quantum dots into microring resonators.
- To achieve deterministic on-chip single-photon emission for quantum information processing.
Main Methods:
- A bottom-up approach was used to deterministically grow single Indium Arsenide Phosphide (InAsP) quantum dots within Indium Phosphide (InP) microrings.
- High quality factor microring cavities were fabricated to incorporate the quantum dots.
- Emitter-cavity coupling efficiency was engineered by optimizing whispering gallery mode spacing.
Main Results:
- Successfully integrated single InAsP quantum dots into InP microring cavities in a single epitaxial run.
- Achieved Purcell-enhanced single-photon emission due to efficient coupling into the microring's whispering gallery mode.
- Demonstrated high coupling probability and multiwavelength single-photon emissions by optimizing mode spacing in larger rings.
Conclusions:
- The developed bottom-up approach offers a deterministic and scalable pathway for on-chip quantum photonics.
- This technology enables the creation of integrated single-photon emitters for miniaturized quantum information processing platforms.
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