Monday 05 September 2016
to 11:00 at
Fabian Pokorny (Fysikum / Kondenserad materia och kvantoptik)
When in 1982 R. Feynman first proposed the use of a known quantum system to simulate an unknown one , 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 .
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  and to enable such operations in larger ion crystals .
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.
 R. Feynman, Int. J. Theor. Phys. 21, 467 (1982)
 J. I. Cirac, P. Zoller, Phys. Rev. Lett. 74, 4091 (1995)
 M. Mueller et al., New J. Phys. 10, 093009 (2008)
 F. Schmidt-Kaler et al., New J. Phys. 13, 075017 (2011)
 W. Li, I. Lesanovsky, Appl. Phys. B 114, 37-44 (2014)
 W. Li et al., Phys. Rev. A 87, 052304 (2013)