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Method for direct coupling of a semiconductor quantum dot to an optical fiber for single-photon source applications
Optics Express
|November 2, 2019
Summary
We developed a new method for directly coupling quantum dots (QDs) to optical fibers. This technique ensures stable fiber-coupled QD emission for quantum technologies.
Area of Science:
- Quantum Optics
- Nanotechnology
- Semiconductor Physics
Background:
- Quantum dots (QDs) are crucial for quantum information processing.
- Efficiently coupling QDs to optical fibers remains a challenge.
Purpose of the Study:
- To present a novel method for direct fiber coupling of quantum dots.
- To achieve stable and efficient light extraction from QDs.
Main Methods:
- Deterministic incorporation of quantum dots into cylindrical mesas.
- Interference-based scanning for precise fiber positioning.
- Etching of fiber end-face to control distance to QD-mesa.
- Photon autocorrelation measurements to verify single-photon emission.
Main Results:
- Demonstrated stable emission around 1260 nm from a fiber-coupled InGaAs/GaAs QD.
- Confirmed stability over multiple cryogenic cooling cycles.
- Experimentally verified single-photon characteristics with g(2)(0) < 0.5.
Conclusions:
- The developed method enables robust fiber coupling of quantum dots.
- This technique is suitable for single-mode and multi-mode fibers.
- The system shows promise for quantum communication and computing applications.
