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Multiplexed Single-Photon Source Based on Multiple Quantum Dots Embedded within a Single Nanowire.

Patrick Laferrière1,2, Edith Yeung1,2, Lambert Giner1,2

  • 1National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6.

Nano Letters
|April 10, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a scalable multi-quantum-dot nanowire for efficient single-photon generation. This multiplexed source demonstrates linear scaling of emission rates, a key step for quantum information technologies.

Keywords:
multiplexingnanowirequantum dotsingle-photon source

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Area of Science:

  • Quantum Information Science
  • Nanophotonics
  • Solid-State Physics

Background:

  • Photonics-based quantum information technologies rely on efficient single-photon sources.
  • Current sources are limited by radiative recombination lifetimes, hindering emission rates.
  • Position-controlled quantum dots in nanowire waveguides offer a scalable fabrication route.

Purpose of the Study:

  • To demonstrate a multiplexed single-photon source using a multi-dot nanowire.
  • To overcome the limitations of radiative recombination lifetimes in single-photon emitters.
  • To achieve scalable, high-efficiency single-photon generation for quantum technologies.

Main Methods:

  • Fabrication of epitaxially grown nanowires incorporating multiple, energy-tuned quantum dots.
  • Precise positioning of quantum dots within the nanowire waveguide for optimal light coupling.
  • Characterization of the multi-dot system to assess emission rates and multiphoton probabilities.

Main Results:

  • Demonstrated a multiplexed single-photon source with linearly scaling emission rates based on the number of emitters.
  • Achieved high single-photon efficiency using multiple energy-tuned quantum dots in a single nanowire.
  • Observed an average multiphoton emission probability below 4% at saturation in a five-dot nanowire.

Conclusions:

  • Successfully integrated multiple single-photon emitters deterministically within a single photonic device.
  • This multi-quantum-dot nanowire approach represents a significant advancement toward achieving GHz single-photon emission rates.
  • The developed technology offers a scalable solution for next-generation quantum information processing and communication systems.