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Q: Quantenoptik und Photonik

Q 10: Quanteneffekte I

Q 10.8: Vortrag

Montag, 13. März 2006, 15:45–16:00, HII

Quantum mechanical detector model for a moving spread-out quantum particle — •Jens Timo Neumann¹, Gerhard C. Hegerfeldt¹, and Lawrence S. Schulman² — ¹Institut für Theoretische Physik, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — ²Physics Department, Clarkson University, Potsdam, New York 13699-5820, USA

Although the space- and time-resolved detection of moving particles is more or less a standard technique for sufficiently fast particles, an extension to single cold atoms showing quantum effects is far from obvious: Concerned with a spreading and extending wave packet, one is faced with highly nontrivial quantum mechanical questions. A deep understanding of these questions can be expected to prove useful in many applications. We investigate a spin-based detector model for the detection of such a moving spread-out quantum particle; the center-of-mass motion as well as the actual detection process are formulated in terms of quantum physics without any recurrence to classical approximations. The relation to the recently proposed fluorescence model for the measurement of quantum arrival times is discussed.