Quantum Optics and Atomic Physics Seminar Title: Deterministic ultracold ion source targeting the Heisenberg limit Speaker: Robert Fickler, Ulm University, Germany Time: Tuesday, June 9 at 10:15 Place: 1520-216 Abstract: We have realized a universal deterministic single ion source on the basis of a linear segmented ion trap applicable to a wide range of elements and molecules [1,2]. Initially, cold 40Ca+ ion crystals are trapped within a segmented linear trap. Those ions are then deterministically extracted and detected with an efficiency of 90% at a distance of 29cm. 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. We have also demonstrated the extraction of mixed ion crystals containing other dopant ions. Ion ray-tracing simulations predict that it is possible to focus down the ion beam to nm resolution with a custom built Einzel-lens [3]. This technique can e.g. be applied to generate color centers in diamond or to implant P into Si. Both systems provide a possible way for the realization of a solid state quantum computer [4,5]. In addition, the electrical properties of semiconductor devices can be greatly enhanced by the deterministic implantation of single ions [6]. [1] J. Meijer et al., Appl. Phys. A 91, 567 (2008) [2] W. Schnitzler et al., Phys. Rev. Lett. 102, 070501 (2009) [3] R. Fickler et al., arXiv:0903.3425 (accepted for publication in Journal of Modern Optics) [4] F. Jelezko et al., Phys. Rev. Lett. 93, 130501 (2004) [5] B. Kane, Nature 393, 133 (1998) [6] T. Shinada et al., Nature 437, 1128 (2005) Michael Drewsen Coffee, tea and bread rolls will be served at 10.00