Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 5: Quantum information: Atoms and ions I
Q 5.5: Vortrag
Montag, 18. März 2013, 12:00–12:15, E 214
Large controllable phase shift from a single trapped ion — •Andreas Jechow1,2, Erik Streed2, Benjamin Norton2, and David Kielpinski2 — 1Universität Potsdam, Photonik, Karl Liebknecht Str 24-25, 14476 Potsdam — 2Centre for Quantum Dynamics, Griffith University, Brisbane, Australia
Laser cooled trapped atomic ions are effectively isolated atoms held at rest and largely free from perturbations, representing a quantum system with control over all degrees of freedom. Recently, we have demonstrated wavelength scale imaging resolution of ytterbium ions trapped in a radio frequency Paul trap utilizing a phase Fresnel lens (PFL). This high spatial resolution and the high NA of the PFL allowed us to perform absorption imaging with a single isolated atom [1].
Here we show new results obtained with the absorption imaging technique. We have induced and measured a large optical phase shift in light scattered by a single trapped atomic ytterbium ion. The phase shift in the scattered component was unraveled by performing spatial interferometry between the scattered light and unscattered illumination light. The optical phase shift of 1.3 radians reaches the maximum value allowed by atomic theory over the accessible range of laser frequencies. Single-atom phase shifts of this magnitude open up new quantum information protocols, including long-range quantum phase-shift-keying cryptography and quantum nondemolition measurement.
[1] E.W. Streed, A. Jechow, B.G. Norton, and D. Kielpinski "Absorption imaging of a single atom, " Nature Communications 3, 933 (2012)