Selective creation of maximum coherence in multi-level Λ system

Praveen Kumar, Svetlana A. Malinovskaya, Ignacio R. Sola, Vladimir S. Malinovsky

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We consider the creation of the maximum Raman coherence in the six-level Λ system using optimal control theory. Optimal fields are designed for different initial conditions, resonant, and off-resonant, using the Krotov method including a reference field into the cost functional. Suppression of the population transfer to the intermediate level is achieved via an additional functional constraint which depends on the system dynamics. We demonstrate that the spectrum of the optimised fields has major contribution from the corresponding resonant frequencies independently of the choice of carrier frequency of the initial guess field. We also indicate that the pulse train emerges as a solution of the control problem of coherence optimisation in multi-level quantum systems.

Original languageEnglish
Pages (from-to)326-331
Number of pages6
JournalMolecular Physics
Volume112
Issue number3-4
DOIs
StatePublished - Feb 16 2014

Keywords

  • Coherent population transfer
  • Optimal control theory
  • Pulse train
  • Raman coherence

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