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Updated: May 14, 2026
09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Bright solid-state sources of indistinguishable single photons.
O Gazzano1, S Michaelis de Vasconcellos, C Arnold
1Laboratoire de Photonique et de Nanostructures, CNRS, UPR20, Route de Nozay, Marcoussis 91460, France.
Nature Communications
|February 7, 2013
Summary
Researchers developed ultrabright sources of indistinguishable single photons using quantum dots in pillar cavities. This advancement boosts the scalability of quantum information processing by achieving high brightness and photon indistinguishability.
Area of Science:
- Quantum Information Science
- Semiconductor Nanophotonics
- Single Photon Sources
Background:
- Scalable quantum information processing requires bright sources of indistinguishable single photons.
- Semiconductor quantum dots are promising candidates for single photon generation.
- Efficient photon collection is crucial for practical quantum applications.
Purpose of the Study:
- To fabricate ultrabright sources of indistinguishable single photons.
- To deterministically position quantum dots within pillar cavities for enhanced performance.
- To investigate the relationship between source brightness, indistinguishability, and excitation conditions.
Main Methods:
- Fabrication of semiconductor quantum dots integrated into pillar cavities.
- Deterministic positioning of single quantum dots.
- Utilizing a two-laser excitation scheme to stabilize the quantum dot electrostatic environment.
- Characterization of photon brightness and indistinguishability.
Main Results:
- Demonstrated ultrabright single photon sources with brightness up to 0.79±0.08 photons per pulse.
- Achieved high photon indistinguishability of 82±10% at a brightness of 0.65±0.06 photons per pulse.
- Showed that a two-laser excitation scheme mitigates environmental fluctuations under high pumping.
Conclusions:
- Deterministic integration of quantum dots in pillar cavities enables ultrabright and highly indistinguishable single photon emission.
- The developed sources are highly promising for scalable quantum information processing.
- Optimized excitation schemes are key to maintaining photon quality at high brightness levels.
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