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Non-Markovian Collective Emission from Macroscopically Separated Emitters
Kanupriya Sinha1,2, Pierre Meystre3, Elizabeth A Goldschmidt1
1U.S. Army Research Laboratory, Adelphi, Maryland 20783, USA.
Physical Review Letters
|February 15, 2020
Summary
We investigated how two emitters in a waveguide affect each other
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.
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