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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Single-photon non-linear optics with a quantum dot in a waveguide.

A Javadi1, I Söllner1, M Arcari1

  • 1Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark.

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|October 24, 2015
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This summary is machine-generated.

Researchers demonstrate a single quantum dot in a photonic-crystal waveguide acting as a giant optical non-linearity. This breakthrough enables efficient single-photon logic operations for quantum computing and information processing.

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Nanophotonics

Background:

  • Non-linear interactions between photons are crucial for optical logic gates but are typically weak, limiting efficiency.
  • A quantum emitter coupled to a propagating mode can enhance photon-photon interactions, enabling novel quantum information processing.
  • Developing efficient all-optical logic gates is essential for advancing classical and quantum information technologies.

Purpose of the Study:

  • To demonstrate a single quantum emitter as a source of giant optical non-linearity at the single-photon level.
  • To investigate the non-linear response of a quantum dot in a photonic-crystal waveguide.
  • To explore the potential of this system for quantum information processing applications.

Main Methods:

  • Utilizing a single quantum dot deterministically coupled to a photonic-crystal waveguide.
  • Analyzing the intensity and quantum statistics of scattered photons to reveal non-linear responses.
  • Investigating the contributions of entangled photon-photon bound states to the non-linearity.

Main Results:

  • A single quantum dot in a photonic-crystal waveguide exhibits giant optical non-linearity, sensitive at the single-photon level.
  • The non-linear response is characterized by the intensity and quantum statistics of scattered photons.
  • Evidence of entangled photon-photon bound states contributing to the observed non-linearity.

Conclusions:

  • A single quantum dot in a photonic-crystal waveguide serves as a powerful platform for giant optical non-linearity.
  • This system enables efficient single-photon level logic operations, crucial for quantum information technology.
  • The findings pave the way for scalable waveguide-based photonic quantum computing architectures and applications like single-photon transistors.