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Ultrafast Population Inversion without the Strong Field Catch: The Parallel Transfer.

Bo Y Chang1, Seokmin Shin1, Ignacio R Sola2

  • 1†School of Chemistry (BK21+), Seoul National University, Seoul 151-747, Republic of Korea.

The Journal of Physical Chemistry Letters
|August 12, 2015
PubMed
Summary

Controlling quantum systems with sublevels is challenging. This study introduces parallel transfer, a geometric control method using coherent superpositions to achieve full population inversion or laser transparency.

Keywords:
Stark shiftcoherent controlquantum dynamicsstrong fieldsultrafast spectroscopy

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Area of Science:

  • Quantum dynamics
  • Molecular physics
  • Laser control

Background:

  • Ultrafast resonant pulses often fail to achieve full population inversion in quantum systems with sublevel structures, such as molecules.
  • Understanding the mechanism blocking population transfer is crucial for developing advanced control strategies.

Purpose of the Study:

  • To explain the mechanism that blocks population transfer in quantum systems with sublevel structures.
  • To introduce a novel geometric control concept for achieving full population inversion or blockade.
  • To demonstrate a method for controlling population dynamics using coherent superpositions.

Main Methods:

  • Developing a geometric control concept based on coherent manipulation within sublevel manifolds.
  • Preparing specific coherent superpositions in the initial manifold.
  • Analyzing the interference in stimulated emission processes and Rabi oscillations.

Main Results:

  • Identified the mechanism responsible for blocked population transfer in quantum systems.
  • Demonstrated that specific coherent superpositions enable full population inversion or complete population blockade (laser transparency).
  • Showed that full population inversion can be achieved irrespective of pulse intensity above a minimal threshold by controlling relative phases.

Conclusions:

  • Introduced a novel control mechanism termed 'parallel transfer' for quantum systems.
  • Parallel transfer allows precise control over population dynamics, enabling full population inversion or blockade.
  • This method offers a pathway to overcome limitations in population transfer using ultrafast laser pulses.