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High-efficiency backward four-wave mixing by quantum interference.

Zi-Yu Liu1, Jian-Ting Xiao1, Jia-Kang Lin1

  • 1Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan.

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|November 19, 2017
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Summary
This summary is machine-generated.

Researchers suppressed spontaneous emission in four-wave mixing (FWM) using a backward laser configuration. This achieved a record 63% conversion efficiency in cold atoms, surpassing previous limits for efficient frequency conversion.

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Area of Science:

  • Quantum optics and atomic physics.
  • Nonlinear optical processes.
  • Laser-matter interactions.

Background:

  • Electromagnetically-induced-transparency (EIT) based four-wave mixing (FWM) in resonant four-level double-Λ systems is limited to 25% conversion efficiency (CE).
  • Spontaneous emission is a primary factor limiting CE in these systems.

Purpose of the Study:

  • To suppress spontaneous emission in EIT-based FWM.
  • To enhance conversion efficiency beyond the established limit.
  • To explore potential applications in quantum information technology.

Main Methods:

  • Utilized a backward configuration for applied laser beams in a double-Λ FWM scheme.
  • Employed cold rubidium atoms with a specific optical depth (OD).
  • Developed a theoretical model incorporating phase-mismatch effects.

Main Results:

  • Achieved a conversion efficiency (CE) of 63% in cold rubidium atoms (OD=48), significantly exceeding the 25% limit.
  • Demonstrated the suppression of spontaneous emission through the backward laser configuration.
  • Theoretical model predicts a potential CE of 96% under ideal conditions (OD=200).

Conclusions:

  • The backward double-Λ FWM scheme effectively suppresses spontaneous emission, enabling record-high conversion efficiencies.
  • This work presents the first observation of CE exceeding the conversion limit in resonant FWM.
  • The developed efficient frequency conversion scheme holds promise for optical quantum information technology.