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Related Concept Videos

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Quasichiral Interactions between Quantum Emitters at the Nanoscale.

C A Downing1, J C López Carreño1,2, F P Laussy2,3

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Summary

We show how two quantum emitters above a metal surface can exhibit tunable chiral coupling. This platform enables exploration of quantum optical properties and reveals a quasichiral regime with sharp spectral features.

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Area of Science:

  • Quantum optics
  • Nanoscale physics
  • Surface plasmonics

Background:

  • Understanding light-matter interactions at the nanoscale is crucial for developing quantum technologies.
  • Chiral coupling typically requires specific material and geometric configurations.
  • Surface plasmons offer unique electromagnetic environments for controlling quantum emitters.

Purpose of the Study:

  • To investigate the coupling between two quantum emitters on a metal surface supporting surface plasmons.
  • To explore the conditions for reciprocal and nonreciprocal interactions.
  • To identify and characterize a quasichiral regime in such systems.

Main Methods:

  • Combined classical and quantum electrodynamics (QED) description.
  • Analysis of emitter-emitter interactions based on position and natural frequency.
  • Investigation of coherent and dissipative coupling mechanisms.

Main Results:

  • Demonstrated tunable chiral coupling by adjusting emitter positions and frequencies.
  • Identified a transition from reciprocal to nonreciprocal interactions.
  • Revealed a quasichiral regime governed by the subradiant state.

Conclusions:

  • The system provides a flexible platform for nanoscale chiral coupling, relaxing traditional constraints.
  • The quasichiral regime exhibits unique quantum optical properties, including sharp spectral features and strong photon correlations.
  • This work opens avenues for novel quantum optical devices and phenomena.