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Preparation of Fock states and quantum entanglement via stimulated Raman adiabatic passage using a four-level atom

  • S.-Q. Gong
  • R. Unanyan
  • K. Bergmann

Abstract:

We study the behaviour of an atom-cavity system exposed to a stimulated Raman adiabatic passage (STIRAP) process in a four-level system, with a coupling scheme which generate two degenerate dark states. We find that the non-adiabatic interaction of the two dark states guarantees that the cavity Fock states can always be generated by both intuitively and counterintuitively ordered pulses. Furthermore, we propose a method to entangle two atoms. Depending on the ordering of the pulses two orthogonal entangled states can be prepared. Since these entangled states do not have component of the excited states included, the technique is robust against the detrimental consequences of spontaneous emission.

PACS. 42.50.Dv Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; operational definitions of the phase of the field; phase measurements – 03.65.Ta Foundations of quantum mechanics; measurement theory 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2002

Authors and Affiliations

  • S.-Q. Gong
    • 1
  • R. Unanyan
    • 1
  • K. Bergmann
    • 1
  1. 1.Fachbereich Physik der Universität, 67653 Kaiserslautern, GermanyDE

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