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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Cavity-enhanced coherent light scattering from a quantum dot.

Anthony J Bennett1, James P Lee2, David J P Ellis1

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We generated highly indistinguishable single photons using quantum dots in cavities, crucial for quantum technologies. This method significantly enhances photon purity and enables super-resolution measurements.

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Photonic quantum technologies

Background:

  • Generating single photons is key for quantum information processing and metrology.
  • Solid-state emitters in optical cavities are promising for single-photon generation.
  • Suppressing unwanted excitation is a major challenge in these systems.

Purpose of the Study:

  • To demonstrate efficient generation of coherent and indistinguishable single photons.
  • To overcome the challenge of unwanted excitation in solid-state quantum emitters.
  • To utilize generated photons for advanced quantum measurements.

Main Methods:

  • Coherent photon scattering from a quantum dot in a micropillar cavity.
  • Resonant optical excitation of solid-state emitters.
  • Deterministic excitation to create two-photon N00N states.

Main Results:

  • Cavity enhancement boosts resonant scattering fraction close to unity.
  • Generated antibunched, indistinguishable photons 16 times narrower than the time-bandwidth limit.
  • Achieved super-resolving phase measurements using two-photon N00N states.

Conclusions:

  • Demonstrated a robust method for generating high-purity single photons from quantum dots.
  • The technique significantly advances the potential of photonic quantum technologies.
  • Enabled advanced quantum metrology applications like super-resolution phase measurements.