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Q: Quantenoptik und Photonik
Q 25: Quanteneffekte II
Q 25.8: Talk
Tuesday, March 23, 2004, 18:30–18:45, HS 218
Analysis of a minimally invasive detector model — •Jens Timo Neumann und Gerhard C. Hegerfeldt — Inst. f. Theor. Physik, Univ. Göttingen, Tammanstr. 1, 37077 Göttingen
Recently, models (J.J. Halliwell, Progr.Theor.Phys. 102 No. 4 (1999), 707-717; L.S. Schulman, talk at 8th Workshop on Time in Quantum Mechanics, Teneriffe 2003) for minimally invasive particle detectors have been proposed, similar to a cloud chamber where a charged particle causes macroscopic changes in the environment without itself being disturbed strongly. In the model, the detector (not the particle!) couples to a large environment only when the wave function of the particle overlaps with the detector. We investigate to what extent the model is truly minimally invasive and show that it has a close relation to quantum optics, with similar limitations as in the detection through fluorescence by means of a laser. Possible optimization schemes are discussed.