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Q: Quantenoptik und Photonik
Q 41: Quanteneffekte IV
Q 41.1: Talk
Wednesday, March 15, 2006, 10:40–10:55, HII
Characterising and manipulating the motion of a single ion — •Daniel Rotter1, Francois Dubin1, Manas Mukherjee1, Carlos Russo1, Christoph Becher2, Jürgen Eschner3, and Rainer Blatt1,4 — 1Institut fuer Experimentalphysik, Universitaet Innsbruck — 2Universitaet des Saarlandes, Saarbruecken — 3ICFO - The Institute of Photonic Sciences, Spain — 4Institut fuer Quantenoptik und Quanteninformation, Oesterreichische Akademie der Wissenschaften, Austria
We observe the secular motion of a single Ba+ ion in a Paul trap over more than 6 orders of magnitude in time, allowing for quantitative characterisation and active manipulation of the motional state. The ion is continuously laser-excited at Doppler cooling conditions. A part of the resonance fluorescence is retro-reflected to create interference fringes [1], such that the ion’s motion produces an amplitude modulation in the detected photocurrent ("self-homodyning"). Feedback control of amplitude and phase of a single vibrational mode has been achieved [2]. In the g(2)(τ) correlation function [3], a beating between two oscillations at ωx / 2π≈1 MHz and ωy / 2π≈1.2 MHz is measured, which demonstrates long-time phase stability between the corresponding modes. The experimental data are in good agreement with a theoretical model.
[1] J. Eschner et al., Nature 413, 495 (2001)
[2] P. Bushev et al., quant-ph/0509125
[3] V. Gomer et al., Phys. Rev. A, 58, R1657, (1998)