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Bright Electrically Contacted Circular Bragg Grating Resonators with Deterministically Integrated Quantum Dots.

Setthanat Wijitpatima1, Normen Auler2, Priyabrata Mudi1

  • 1Institute of Solid State Physics, Technische Universität Berlin, Hardenbergstraße 36, Berlin 10623, Germany.

ACS Nano
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Summary

We developed electrically controlled quantum dot-circular Bragg grating resonators for brighter quantum devices. These high-performance quantum light sources achieve excellent photon extraction efficiency and purity for quantum information systems.

Keywords:
circular Bragg gratingdeterministic integrationelectro-opticsphoton extraction efficiencysemiconductor quantum dotssingle-photon sources

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Area of Science:

  • Quantum Optics
  • Materials Science
  • Nanotechnology

Background:

  • Semiconductor quantum dots (QDs) are crucial for quantum devices.
  • Efficient light extraction from QDs is needed for quantum photonic applications.
  • Electrical control of QDs enhances device functionality.

Purpose of the Study:

  • To design and fabricate electrically controlled quantum dot-circular Bragg grating (QD-CBG) resonators.
  • To improve photon extraction efficiency (PEE) and electro-optical properties of QD light sources.
  • To enable advanced quantum photonic applications.

Main Methods:

  • Combining circular Bragg grating (CBG) with PIN-diode structures.
  • Numerical simulations for device parameter fine-tuning.
  • Deterministic nanoprocessing for QD-CBG resonator fabrication.

Main Results:

  • Achieved electrically controlled single QD-CBG resonators with tunable emission.
  • Demonstrated a photon extraction efficiency (PEE) of up to 30.4(3.4)%, with potential for >50%.
  • Obtained high single-photon purity (99.2(2)%) and photon indistinguishability (75(5)%).

Conclusions:

  • Developed high-performance quantum light sources with cavity enhancement and electrical control.
  • These QD-CBG resonators are promising for quantum information systems, including quantum repeaters.
  • The study demonstrates significant progress in deterministic quantum device fabrication.