Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum Optics III
Q 20.4: Talk
Tuesday, March 1, 2016, 11:45–12:00, f442
Phase shifting a weak coherent beam by a single 174Yb+ ion — •Martin Fischer1,2, Lucas Alber1,2, Bharath Srivathsan1,2, Markus Weber1,2, Markus Sondermann1,2, and Gerd Leuchs1,2,3 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Friedrich-Alexander University Erlangen-N ürnberg (FAU), Department of Physics, Erlangen, Germany — 3Department of Physics, University of Ottawa, Canada
We report on the phase shift induced on a weak coherent beam of light acting on the π-transition of a single 174Yb+ ion. The π-transition is driven by focusing a radially-polarized donut-mode with a deep parabolic mirror, covering 94% of the relevant solid angle, onto the ion. The phase shift is measured in a heterodyne configuration with a local oscillator detuned by twenty linewidths from the investigated atomic transition. Measurements with a still imperfectly corrected parabolic mirror show phase shifts of 3∘, as expected for the coupling efficiency determined through saturation measurements.
The measured phase shift deviates significantly from the predicted phase shift of a two-level system [1]. We discuss the influence of coupling to a J=1/2 to J=1/2 transition instead of coupling to a two-level system and estimate the residual aberrations limiting the observable phase shift. Prospects of using 174Yb2+ as a target for the dispersive interaction are discussed.
M. Sondermann et al., J. Europ. Opt. Soc. Rap. Public. 8, 13052 (2013)