Stuttgart 2012 – wissenschaftliches Programm
Q 33.7: Vortrag
Dienstag, 13. März 2012, 15:45–16:00, V55.01
Minimizing Time Dilation in Ion Traps for an Optical Clock — •Karsten Pyka1, Norbert Herschbach1, Kristijan Kuhlmann1, Jonas Keller1, David-Marcel Meyer1, and Tanja E. Mehlstäubler1,2 — 1Quest-Institute, Physikalisch-Technische Bundesanstalt, Braunschweig — 2Department of Time & Frequency, Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig
We present a new experimental setup to test scalable chip-based ion traps for the development of trap structures with reduced excess micromotion that allow precision spectroscopy on a large ensemble of ions. Based on our finite-element calculations  a novel trap is built employing high-precision laser machining and surface coating processes at PTB.
In a prototype made of Rogers4350B™ we have succesfully trapped linear chains and 3D-Coulomb crystals of 172Yb+ ions. We emphasize on the precision measurement of excess micromotion of a single 172Yb+ ion using photon-correlation spectroscopy. We are able to resolve a micromotion amplitude of ≈1.1 nm corresponding to a fractional frequency shift of the atomic transition of less than 10−19.
With this resolution we were able to characterize our prototype trap to have an axial rf electric field gradient that allows the trapping of linear Coulomb crystals of twelve ions, that experience a fractional frequency shift due to time-dilation of less than 10−18.
 Herschbach et al., Appl. Phys. B, (2011), DOI: 10.1007/s00340-011-4790-y