Matt's Blog

Today on the archive

Fri Aug 11 12:09:17 BST 2006

  • [quant-ph/0608089]

    • Title: Efficient coherent internal state transfer in trapped ions using Stimulated Raman Adiabatic Passage
    • Authors: Jens L. Sørensen, Ditte Møller, Theis Iversen, Jakob B. Thomsen, Frank Jensen, Peter Staanum, Dirk Voigt, Michael Drewsen
    • Abstract: We demonstrate experimentally how the process of Stimulated Raman Adiabatic Passage (STIRAP) can be utilized for efficient coherent internal state transfer in single trapped and laser-cooled $^{40}$Ca$^+$ ions. The transfer from the D${3/2}$ to the D${5/2}$ state, is detected by a fluorescence measurement revealing the population not transfered to the D$_{5/2}$ state. A coherent population transfer efficiency at the level of 95 % in a setup allowing for the internal state detection of individual ions in a string has been obtained.
    • Comment: STIRAP methods are nice, they are robust against laser frequency fluctuations and decoherence as long as you have enough laser power. One chapter of my thesis considered using a STIRAP process at 393nm and 854nm to transfer population selectively from the ground state Zeeman sublevels to the D$_{5/2}$ shelf (so a similar process to this paper), but the low power of the blue diode laser we were using ruled out this possibility. This paper uses two higher power infra-red lasers to drive a similar STIRAP process.
  • [quant-ph/0608094]

    • Title: Spectrum of coherent backscattering of light by two atoms
    • Authors: Vyacheslav Shatokhin
    • Abstract: We study theoretically inelastic spectrum of coherent backscattering of laser light by two atoms. For an intense laser field, there are frequency domains of not only constructive but also destructive (self-)interference of the inelastic photons. We interpret the emergent spectral features using the dressed states and considering coherent backscattering as a kind of the pump-probe experiment.
    • Comment: I am interested in coherent backscattering for use as an atom cooling method, so will need to read this paper more thouroughly when I get a chance.

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