Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster 2

Q 35.37: Poster

Wednesday, March 14, 2012, 16:30–19:00, Poster.I+II

Pointer State Optimization — •Raoul Heese and Matthias Freyberger — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany

Arthurs and Kelly’s simultaneous measurements in the spirit of von Neumann involve two pointer systems which are coupled to a quantum system to be measured. It seems natural to ask which pointers are optimal for a given system state at hand. This, however, requires to define optimality, which can on the one hand be approached with the help of traditional uncertainty relations, or, on the other hand, by means of entropic measures. Both concepts can lead to totally different directions of optimization. Similarly, the question arises whether there even exist such optimal pointer states for all possible system states to be measured.