Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 13: Quanteninformation: Konzepte III

Q 13.6: Talk

Monday, March 2, 2009, 17:45–18:00, VMP 6 HS-D

Concepts of simultaneity in quantum measurements — •Michael Bußhardt and Matthias Freyberger — Institut für Quantenphysik, Universität Ulm, 89069 Ulm, Germany

The concept of simultaneous measurements of conjugate variables is reviewed. We especially focus on setups in the optical domain, where the quadratures of the electromagnetic field do not commute and, therefore, cannot be precisely measured simultaneously. However, by allowing the system under investigation to interact with certain classes of additional ruler systems, we can still obtain information about non-commuting observables in a simultaneous measurement. The question arises, which kinds of ruler states are optimal to gain specific knowledge about the system at hand. We focus on the advantage of entangled ruler states, as well as on the possibility to use such setups for state preparation. Moreover, in order to understand the true meaning of simultaneity, we explicitely consider time-dependent interactions.