Dresden 2011 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 32: Quantum Information: Atoms and Ions 3

Q 32.5: Talk

Wednesday, March 16, 2011, 15:30–15:45, HÜL 386

Measuring the Magnetic induced J-coupling between two ions — •Anastasiya Khromova, Andrés Felipe Varón, Benedikt Scharfenberger, Christian Piltz, Timm Gloger, and Christof Wunderlich — Fachbereich Physik, Universität Siegen, Walter-Flex-Straße 3, 57068 Siegen

Two 171Yb+ ions are electrodynamically trapped in presence of a magnetic gradient field. This magnetic field not only allows to address the ions independently [1] but also accounts for an effective spin-spin coupling [2]. This interaction was measured in a linear Paul trap using spin echo techniques on Doppler-cooled ions.

The magnetic field gradient is produced by means of two permanent magnets with identical poles facing toward each other and reaches up to 17 T/m. Having the axial trap potentials in the range of hundred kilohertz we are able to measure coupling constants of a few tens of hertz. The measured values we obtained are in good agreement with the theoretical expectations.

[1] M. Johanning et al., Phys. Rev. Lett. 102, 073004 (2009).

[2] Chr.Wunderlich, Laser Physics at the Limits, p.261, (Springer, 2002), arXiv:quant-ph/0111158