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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Hybrid Confinement Techniques for Polariton Simulators.

Johannes Düreth1, Philipp Gagel1, David Laibacher1

  • 1Julius-Maximilians-Universität Würzburg, Physikalisches Institut, and Würzburg-Dresden Cluster of Excellence ctd.qmat, Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Lehrstuhl für Technische Physik, Am Hubland, 97074 Würzburg, Germany.

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Summary

Novel fabrication methods for III-V semiconductor microcavities enable advanced topological photonics and quantum simulations. These techniques create deep potentials for precise control and tight polariton localization, unlocking new photonic functionalities.

Keywords:
Exciton-polaritonsmicrocavity lattice designphotonic latticespolariton condensationquantum simulation

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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Materials Science

Background:

  • III-V semiconductor microcavities are crucial for quantum simulation and topological photonics.
  • Traditional fabrication methods face limitations in achieving precise photonic confinement.

Purpose of the Study:

  • Introduce novel fabrication techniques: etch-and-oversputter and deposit-and-oversputter.
  • Overcome limitations in photonic confinement for advanced photonic functionalities.
  • Enable emulation of complex Hamiltonians for quantum simulation.

Main Methods:

  • Utilized structured, locally elongated semiconductor cavities for deep, controllable potentials.
  • Employed high-quality GaAs-based materials for excellent Q-factors.
  • Integrated a sputtered all-dielectric top mirror, a hybrid fabrication approach.

Main Results:

  • Achieved high-quality optical band structures in Kagome lattices, surpassing deep etching.
  • Demonstrated polariton lasing from a zero-dimensional corner mode in a breathing Kagome lattice.
  • Confirmed precise control over couplings and tight polariton localization.

Conclusions:

  • These methods facilitate the fabrication of intricate lattices, including higher-order topological insulators.
  • Enable on-chip quantum regimes via the polariton blockade mechanism.
  • Offer a robust platform for advanced photonic functionalities and quantum simulation.