Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster: Quantum Optics and Photonics III
Q 42.7: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
Measurement of ion heating rate in a planar ion trap at variable distance to the trap surface — •Ivan Boldin and Christof Wunderlich — University of Siegen, Germany
Electric field noise in the vicinity of metal surfaces is an important issue in various fields of experimental physics. In experiments with cold trapped ions such noise results in heating of the ions’ motional degrees of freedom. In realizations of quantum information processing based on trapped ions this heating can become a major source of decoherence. Since this effect scales as 1/d4 (with the ion-electrode separation d), it is particularly prominent for planar electrode ion traps where this separation can be as small as tens of micrometers.
This electric field noise-induced heating has been studied in many experimental and theoretical works over the last years [1 - 3]. However, to our knowledge there has been no direct experimental measurement of the heating rate of ions above a single planar electrode ion trap as a function of the ion-surface separation. Here, we present the result of such measurements. Our trap is made of gold electroplated on sapphire [4]. The ion-surface distance can be varied in the range of 45 - 155 µm. We measure the heating rate by the recooling method that is, measuring the photon scattering rate as a function of time after allowing the ion to heat up for a certain time.
1) L. Deslauriers et al., PRL 97, 103007 (2006);
2) M. Brownnutt et al., arXiv:1409.6572 (2014);
3) I. Talukdar et al., arXiv:1511.0062 (2015);
4) P.J. Kunert et al., Appl. Phys. B 114, 27-36 (2014).