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Q: Fachverband Quantenoptik und Photonik
Q 15: Quantum Information (Concepts and Methods) II
Q 15.5: Talk
Monday, March 5, 2018, 15:15–15:30, K 1.019
Reduction of a quantum state in time-of-flight measurements — •Fabio Di Pumpo and Matthias Freyberger — Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, D-89069 Ulm
We discuss quantum mechanical time-of-flight momentum measurements, which are motivated by the classical time-of-flight concept. Our setup is modeled by a Hamiltonian for a free particle interacting with two quantum pointers. For this model we can solve the corresponding three-particle dynamics in the Heisenberg picture. This allows us to examine two fundamental aspects: First, we verify that the expectation value of the operational momentum operator equals the one of the original momentum operator describing the single-particle system. Second, we analyze in what sense position measurements on the pointers reduce the conditional quantum state of the particle and hence define its momentum.