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Sculpting ultrastrong light-matter coupling through spatial matter structuring.

Joshua Mornhinweg1,2, Laura Diebel1, Maike Halbhuber1

  • 1Department of Physics, University of Regensburg, 93040 Regensburg, Germany.

Nanophotonics (Berlin, Germany)
|April 29, 2024
PubMed
Summary
This summary is machine-generated.

Researchers sculpted ultrastrong multi-mode coupling by controlling light-matter interactions in terahertz (THz) resonators and 2D electrons. This allows precise control over quantum properties for advanced quantum information processing.

Keywords:
THz metasurfacescavity-QEDmulti-mode couplingpolaritonic control

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Area of Science:

  • Quantum Optics
  • Condensed Matter Physics
  • Nanophotonics

Background:

  • Cavity quantum electrodynamics (cQED) studies coupling single optical modes with matter excitations, forming cavity polaritons.
  • Ultrastrong coupling (ΩR/ωc ≈ 1) leads to broad polariton doublets, enabling multi-mode interactions.
  • Multi-mode coupling offers enhanced control over light-matter resonances but increases complexity.

Purpose of the Study:

  • To experimentally implement a novel strategy for sculpting ultrastrong multi-mode coupling.
  • To control light-matter interactions on subwavelength scales using tailored spatial overlap.
  • To investigate the influence of magnetic tuning on coupled quantum systems.

Main Methods:

  • Utilized planar metallic THz resonators and Landau-quantized 2D electrons.
  • Tailored the spatial overlap between resonator modes and electron cyclotron resonances.
  • Applied magnetic fields to tune the cyclotron resonances.

Main Results:

  • Demonstrated control over coupling pathways, suppressing or enhancing specific interactions.
  • Successfully controlled the number of light-matter coupled modes and their octave-spanning spectra.
  • Showcased tunable responses of the coupled system to magnetic fields, analogous to classical optics selection rules.

Conclusions:

  • The developed strategy enables precise sculpting of ultrastrong multi-mode coupling.
  • Offers new pathways for controlling dissipation, quantum light sources, nonlinearities, correlations, and entanglement.
  • Provides a versatile platform for quantum information processing applications.