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Optical fibre-based single photon source using InAsP quantum dot nanowires and gradient-index lens collection
David B Northeast1, Dan Dalacu2, John F Weber2
1National Research Council Canada, Ottawa, ON, K1A 0R6, Canada. david.northeast@nrc-cnrc.gc.ca.
Scientific Reports
|November 25, 2021
Summary
We developed a compact, fiber-coupled single photon source utilizing semiconductor quantum dots in a nanowire waveguide. This stable, high-brightness device achieves 98.5% purity and 10% overall efficiency for quantum applications.
Area of Science:
- Quantum Optics
- Nanophotonics
- Semiconductor Physics
Background:
- Single photon sources are crucial for quantum information processing.
- Efficient fiber-coupling is essential for practical quantum technologies.
- Semiconductor quantum dots offer tunable and bright single photon emission.
Purpose of the Study:
- To create a compact and efficient fiber-coupled single photon source.
- To demonstrate high single photon purity and collection efficiency.
- To enable on-demand and plug-and-play operation for quantum applications.
Main Methods:
- Utilizing InAsP semiconductor quantum dots embedded in InP nanowire waveguides.
- Employing gradient-index (GRIN) lenses for efficient photon collection and fiber coupling.
- Implementing pulsed excitation for on-demand single photon generation.
Main Results:
- Achieved a stable, high-brightness fiber-coupled single photon source.
- Demonstrated on-demand operation with 98.5% single photon purity.
- Obtained a source-fiber collection efficiency of 35% and overall efficiency of 10%.
Conclusions:
- The developed system is a promising compact source for quantum applications.
- Room temperature operation and alignment are feasible using photoluminescence.
- This technology advances the development of practical quantum devices.
