Darmstadt 2008 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Ultrakalte Atome (Fallen und Kühlung)
Q 62.4: Vortrag
Freitag, 14. März 2008, 14:45–15:00, 3B
Observation of a trapped cloud of electrons in a planarcryogenic Penning trap — •Pavel Bushev1,2, Stefan Stahl2, Michael Hellwig1,4, Michael Ferner1, Riccardo Natali3, Gerrit Marx4, Günther Werth2, and F. Schmidt-Kaler1 — 1Institut für Quanteninformationsverarbeitung,Universität Ulm, D-89069 Ulm — 2Institut fürPhysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz — 3Dipartimento di Fisica, Università degli Studidi Camerino, 62032 Camerino, Italy — 4Institutfür Physik, Ernst Moritz Arndt-Universität Greifswald,D-17489 Greifswald
We have succeeded in trapping, cooling and detecting clouds of electrons by using a cryogenic planar Penning trap which is installed in a dilution refrigerator. The trap consists of concentric rings with a diameter of a few millimeters [1]. The operating temperature range is 50-100 mK, the magnetic field is about 1 Tesla. We observed a lifetime of trapped electrons of about 3 hours. In the planar geometry, a strong anharmonicity of the trapping potential prevents us from observing single electrons. The ways to diminish such anharmonicity and the current status of cryogenic electron trapping will be presented. The single electron will be used for an application in quantum computing [2]. Here the spin of an individually trapped electron represents a qubit, which can be coherently manipulated with pulses of a microwave field. Entanglement between electronic qubits is achieved by an electrical connection of the electrodes of separate traps.
[1] S. Stahl et. al., Eur. Phys. J. D. 32, 139 (2005).
[2] G. Ciaramicioli et. al, Phys. Rev. Lett. 91, 017901 (2003).