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Applied Physics B

, Volume 81, Issue 1, pp 5–12 | Cite as

Dark resonances as a probe for the motional state of a single ion

  • C. Lisowski
  • M. Knoop
  • C. Champenois
  • G. Hagel
  • M. Vedel
  • F. Vedel
Article

Abstract

Single, rf-trapped ions find various applications ranging from metrology to quantum computation. High-resolution interrogation of an extremely weak transition under best observation conditions requires an ion almost at rest. To avoid line-broadening effects such as the second-order Doppler effect or rf heating in the absence of laser cooling, excess micromotion has to be eliminated as far as possible. In this paper the motional state of a confined three-level ion is probed, taking advantage of the high sensitivity of observed dark resonances to the trapped ion’s velocity. Excess micromotion is controlled by monitoring the dark-resonance contrast with varying laser-beam geometry. The influence of different parameters such as the cooling laser intensity has been investigated experimentally and numerically.

PACS

32.80.Pj 39.30.+w 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • C. Lisowski
    • 1
  • M. Knoop
    • 1
  • C. Champenois
    • 1
  • G. Hagel
    • 1
  • M. Vedel
    • 1
  • F. Vedel
    • 1
  1. 1.Physique des Interactions Ioniques et Moléculaires (CNRS UMR 6633)Université de ProvenceMarseille Cedex 20France

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