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SUMMARY:A single ion in the focus of a parabolic mirror - Building block t
 owards efficient free-space light-matter interaction - Robert Maiwald (Max
  Planck Institute)
DTSTART:20130423T083000Z
DTEND:20130423T093000Z
UID:TALK44577@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:An optimized process of light-matter interaction is crucial fo
 r applications such as quantum memories\, gate operations and entanglement
  distribution. Our contribution to this field focuses on the efficient int
 eraction of light with single atomic ions in free space. This approach req
 uires mode-matching of the incoming light field to a dipole transition of 
 the ion. For this purpose we prepare a spatially and temporally formed lig
 ht mode that has – after focusing – an almost perfect overlap with the
  emission of a linear dipole. With a specialized ion trap we place a singl
 e 174Yb+ ion in the focus of a parabolic mirror covering 81 % of the solid
  angle surrounding the ion. This set-up allows one to directly interface t
 he tailored light mode with the single ion and\, in reverse\, to collect a
 lmost 55 % of the light emitted by the ion\, thus surpassing the theoretic
 al limit of a lens-based set-up. We use the saturation of the ion’s cool
 ing transition as a measure for the light-matter interaction efficiency to
  characterize the quality of the incoming light mode and the spread of the
  parabolic mirror’s focal spot. Additionally\, imaging the ion’s fluor
 escence via the parabolic mirror yields the highest resolution achieved so
  far with single atoms.\n\n
LOCATION:Rutherford building\, Seminar Room B
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