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Triggered indistinguishable single photons with narrow line widths from site-controlled quantum dots
K D Jöns1, P Atkinson, M Müller
1Institut für Halbleiteroptik und Funktionelle Grenzflächen and Research Center SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany. k.joens@ihfg.uni-stuttgart.de
Nano Letters
|December 4, 2012
Summary
Researchers achieved high-quality single-photon emission from quantum dots. This breakthrough enables the development of advanced quantum photonic circuits using indistinguishable photons.
Area of Science:
- Quantum optics
- Solid-state physics
- Materials science
Background:
- Quantum dots are crucial for quantum technologies.
- Achieving high-quality single-photon sources is essential for quantum computing and communication.
Purpose of the Study:
- To develop highly efficient and indistinguishable single-photon sources.
- To demonstrate the potential of site-controlled quantum dots for quantum photonic circuits.
Main Methods:
- Utilizing site-controlled Indium Gallium Arsenide (InGaAs)/Gallium Arsenide (GaAs) quantum dots.
- Employing overgrowth on ex situ pit-patterned substrates.
- Implementing vertical stacking of spectrally distinct quantum dot layers.
Main Results:
- Achieved narrow line width (7 μeV) single-photon emission.
- Demonstrated nearly background-free emission (g((2))(0) = 0.02).
- Produced highly indistinguishable photons (V = 0.73).
Conclusions:
- The developed quantum dots exhibit excellent properties for single-photon generation.
- This method facilitates large-scale integration of quantum dots into quantum photonic circuits.
- The study offers a pathway towards practical quantum photonic devices.
