Berlin 2014 – scientific programme

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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 11: Quantenmechanik

MP 11.2: Talk

Thursday, March 20, 2014, 16:50–17:10, SPA SR125

Uncertainty relation for simultaneous measurements in a thermal environment — •Raoul Heese and Matthias Freyberger — Institut für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany

Uncertainty relations for simultaneous measurements of conjugate observables date back to the theory of Arthurs and Kelly, who considered a model of two pointer systems, which are coupled to a quantum system to be measured and act as the measurement apparatus. We extend this classic model by including a thermal environment in which the pointers behave as coupled particles under Brownian motion. In this sense the pointers behave like classical measurement devices. This novel approach leads us to a new kind of uncertainty relation for so-called open pointer-based simultaneous measurements of conjugate observables.