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Light-Matter Interaction at the Transition between Cavity and Waveguide QED.

Daniel Lechner1, Riccardo Pennetta1, Martin Blaha1

  • 1Department of Physics, Humboldt-Universität zu Berlin, 12489 Berlin, Germany.

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|September 22, 2023
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This summary is machine-generated.

Researchers explored the transition between cavity quantum electrodynamics (QED) and waveguide QED using cold atoms in a fiber-ring resonator. They observed a shift from Rabi oscillations to non-Markovian dynamics by altering resonator length.

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Area of Science:

  • Quantum optics
  • Quantum electrodynamics
  • Atomic physics

Background:

  • Cavity quantum electrodynamics (QED) studies light-matter interactions in discrete modes.
  • Waveguide QED explores strong coupling in continuous modes, offering new possibilities.
  • Both fields aim to understand and control light-matter coupling.

Purpose of the Study:

  • To experimentally investigate the transition from cavity QED to waveguide QED.
  • To explore light-matter coupling in a tunable system.
  • To bridge the gap between discrete and continuous mode descriptions in QED.

Main Methods:

  • Utilizing an ensemble of cold atoms coupled to a fiber-ring resonator with a nanofiber section.
  • Systematically varying the resonator length to modify the spectral density of modes.
  • Operating within the strong coupling regime throughout the experiment.

Main Results:

  • Observed a continuous transition by increasing resonator length.
  • Demonstrated a shift from cavity QED's Rabi oscillations to waveguide QED's non-Markovian dynamics.
  • Showcased the ability to tailor mode density and control light-matter coupling.

Conclusions:

  • The study provides an experimental platform for exploring the transition between cavity and waveguide QED regimes.
  • Findings highlight the tunability of light-matter interaction by controlling the spectral environment.
  • This work offers insights into fundamental quantum phenomena and potential applications in quantum technologies.