In order to enable an iCal export link, your account needs to have an API key created. This key enables other applications to access data from within Indico even when you are neither using nor logged into the Indico system yourself with the link provided. Once created, you can manage your key at any time by going to 'My Profile' and looking under the tab entitled 'HTTP API'. Further information about HTTP API keys can be found in the Indico documentation.
Additionally to having an API key associated with your account, exporting private event information requires the usage of a persistent signature. This enables API URLs which do not expire after a few minutes so while the setting is active, anyone in possession of the link provided can access the information. Due to this, it is extremely important that you keep these links private and for your use only. If you think someone else may have acquired access to a link using this key in the future, you must immediately create a new key pair on the 'My Profile' page under the 'HTTP API' and update the iCalendar links afterwards.
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(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)