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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 Leuchs1,2,31Max 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)

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