Hamburg 2009 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster II

Q 30.24: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster

Focusing down the beam of a deterministic single ion source to nm resolution — •Robert Fickler, W. Schnitzler, N. M. Linke, F. Schmidt-Kaler, and K. Singer — Universität Ulm, Institut für Quanteninformationsverarbeitung, Albert-Einstein-Allee 11, D-89069 Ulm

We have realized a universal deterministic ultracold ion source on the basis of a segmented linear ion trap [1,2]. For single ion extraction we measured a mean velocity of 19.47km/s with a 1σ-spread of only 6.3m/s and a beam divergence of 600µrad. Due to the small chromatic and spherical aberration it should be possible to focus down this beam to a few nm with a simple einzel-lens [3]. In order to optimize the shape and dimension of the lens we calculated different versions with a custom-made numerical ion-ray-tracing simulation. The realized lens consists of three asymmetric layers, has an aperture of 1mm, a focal length of 10mm and is operated in the accelerating mode. Simulations for a beam with the attributes of the measured data predict a focal spot size in the nm regime and show that it is possible to achieve a spot radius of 1nm with ions cooled to the motional ground state. With our setup targeting the Heisenberg limit we have realized the perfect point source for implanting ions on demand with nm resolution, which e.g. is essential for realizing a scalable quantum computer [4].

[1] J. Meijer et al., Appl. Phys. A83, 321 (2006)

[2] J. Meijer et al., Appl. Phys. A91, 567 (2008)

[3] K. Shimizu, Jpn. J. Appl. Phys. 22, 1623 (1983)

[4] F. Jelezko et al., Phys. Rev. Lett. 93, 130501 (2004)