Robust state preparation in a degenerate four-state system

A. Karpati, Z. Kis, P. Adam

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2 Citations (Scopus)


A robust method utilizing a combination of optical pumping and a series of coherent excitation processes is developed for preparing any pure and a wide class of mixed quantum states in the decoherence-free ground-state subspace of a degenerate four-state system. For a given pulse sequence the same final state is obtained regardless of the initial state of the system. An example is presented where a pure state is prepared by a series of excitation processes in the two-dimensional dark subspace of the atom.

Original languageEnglish
Pages (from-to)41-47
Number of pages7
JournalActa Physica Hungarica, Series B: Quantum Electronics
Issue number1-2
Publication statusPublished - May 23 2005



  • Coherent
  • Incoherent
  • Mixed state
  • Preparation

ASJC Scopus subject areas

  • Condensed Matter Physics

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