Molecular Physics seminar

Rydberg excitation of trapped strontium ions

by Fabian Pokorny (Fysikum / Kondenserad materia och kvantoptik)

FA31 ()


When in 1982 R. Feynman first proposed the use of a known quantum system to simulate an unknown one [1], a whole new scientific field opened up. However, it was only in 1995 after a proposal by I. Cirac and P. Zoller that researchers started to conduct experiments in this up-to-then theoretical field. The physical system they suggested to carry out quantum simulation and quantum information processing experimentally were cold trapped ions [2]. In the first part of my talk I will give a brief introduction to this highly successful experimental field, its advantages and its limitations and I will mo- tivate the use of trapped ions excited into Rydberg states as a novel approach for quantum information processing [3, 4]. This idea joins the advanced quan- tum control one can achieve in trapped ion systems with the strong dipolar interaction between Rydberg atoms. For trapped ions this method promises to speed up entangling interactions [5] and to enable such operations in larger ion crystals [6]. In the second part of my talk I will present the experiment we have set up to realize such a system of trapped Rydberg ions. A single strontium ion is confined in a linear Paul trap and excited to Rydberg states with principal quantum numbers from 25 to 42 using a two-photon excitation scheme with 243nm and 304-309nm laser light. The experimental setup will be explained and our the recent results will be shown. [1] R. Feynman, Int. J. Theor. Phys. 21, 467 (1982) [2] J. I. Cirac, P. Zoller, Phys. Rev. Lett. 74, 4091 (1995) [3] M. Mueller et al., New J. Phys. 10, 093009 (2008) [4] F. Schmidt-Kaler et al., New J. Phys. 13, 075017 (2011) [5] W. Li, I. Lesanovsky, Appl. Phys. B 114, 37-44 (2014) [6] W. Li et al., Phys. Rev. A 87, 052304 (2013)