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Non-Markovian Collective Emission from Macroscopically Separated Emitters.

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Area of Science:

  • Quantum optics
  • Condensed matter physics

Background:

  • Collective radiative decay describes how multiple emitters lose energy simultaneously.
  • Dicke superradiance and subradiance are well-known phenomena in this context.
  • Non-Markovian dynamics occur when the system's future depends on its entire past history.

Purpose of the Study:

  • To explore the collective radiative decay of two emitters coupled to a waveguide.
  • To investigate the impact of emitter separation on spontaneous emission.
  • To analyze the non-Markovian dynamics induced by electromagnetic field feedback.

Main Methods:

  • Theoretical modeling of two-level emitters coupled to a 1D waveguide.
  • Analysis of the electromagnetic field's retarded backaction.
  • Investigation of coherent time-delayed feedback effects.

Main Results:

  • Emitter separation comparable to photon coherence length leads to non-Markovian dynamics.
  • Retarded backaction from the waveguide significantly influences decay rates.
  • Observed enhancement or inhibition of collective emission beyond standard superradiance/subradiance.

Conclusions:

  • Coherent time-delayed feedback creates novel collective emission phenomena.
  • The system exhibits strongly non-Markovian behavior due to cavity-like field propagation.
  • This study offers insights into quantum feedback and light-matter interactions in structured reservoirs.