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Spatial quantum-interference landscapes of multi-site-controlled quantum dots coupled to extended photonic cavity
Jiahui Huang1,2, Alessio Miranda3, Wei Liu1
1Mesoscopic Optics and Quantum Electronics Laboratory, Department of Electrical and Computer Engineering, University of California, 420 Westwood Plaza, Los Angeles, CA 90095 USA.
Communications Physics
|April 14, 2025
Summary
We observed spatial repulsion of quantum dot (QD) emissions in photonic crystal (PhC) cavities, controlled by QD position and light-matter interactions. This finding enables new possibilities for integrated quantum photonic circuits.
Area of Science:
- Quantum optics
- Materials science
- Nanophotonics
Background:
- Quantum dots (QDs) embedded in photonic crystals (PhCs) are promising for integrated quantum photonic circuits.
- Photonic structures can modify QD emission via Purcell effect or strong light-matter interactions.
- Spatial effects of photonic states on QD emissions are underexplored due to random QD positioning.
Purpose of the Study:
- To investigate the spatial features of exciton emissions from site-controlled QDs in PhC cavities.
- To explore the influence of photonic states on the spatial distribution of QD emissions.
- To understand the role of quantum interference in these systems.
Main Methods:
- Utilizing site-controlled quantum dots (QDs) embedded in photonic crystal (PhC) cavities.
- Employing polarized imaging of micro-photoluminescence to analyze spatial emission patterns.
- Investigating detuning-dependent spatial repulsion effects based on controlled QD positions within a photonic pattern.
Main Results:
- Observed detuning-dependent spatial repulsion of QD exciton emissions.
- Demonstrated a spatial signature of exciton emission influenced by the controlled QD position.
- Attributed the effect to quantum interference between the QD decay channel and a spatially extended cavity mode.
Conclusions:
- Site-controlled QDs in tailored PhC structures exhibit spatial emission characteristics.
- Quantum interference plays a key role in the observed spatial repulsion.
- This integration enables the development of spatially distributed single-photon sources and photon switches for quantum technologies.
