Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology

Q 16.63: Poster

Monday, March 17, 2014, 16:30–18:30, Spree-Palais

Planar microwave structures for electron guiding — Jakob Hammer, Stephan Heinrich, •Philipp Weber, and Peter Hommelhoff — Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 1, 91058 Erlangen

We investigate electron guiding in a miniaturized planar AC-quadrupole guide (linear Paul trap) [1]. Here electrons propagate freely along the electrodes of a micro-fabricated chip and experience a tight transverse harmonic confinement. The surface electrode structure is driven at microwave frequencies, which results in trapping frequencies of several 100 MHz and enables precise control of slow electrons at 1-10 eV by means of purely electric fields.

Here we discuss ongoing experimental efforts to extend trapping frequencies of electron guiding into the GHz range. For this means we are developping a clean room process for the fabrication of smaller electrode designs. We also discuss electrically long electrode structures, where traveling wave effects have to be considered in the electrode layout [2]. For trapping frequencies on the order of ∼ 1 GHz the quantum mechanical ground state of the guiding potential is 100 nm in size which is resolvable by conventional electron optics. This encourages experiments to prepare electron matter-waves in the transverse motional ground state by matching the wavefunction of an incident electron with the ground state of the microwave guide.

[1] J. Hoffrogge, R. Fröhlich, M. Kasevich and P. Hommelhoff, Phys. Rev. Lett. 106, 193001 (2011).

[2] J. Hoffrogge, et al., Phys. Rev. Lett. 106, 193001 (2011).