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Q: Fachverband Quantenoptik und Photonik
Q 50: Quantum Effects: Entanglement and Decoherence
Q 50.9: Talk
Thursday, March 17, 2011, 12:30–12:45, SCH A01
Operator ordering and causality — •Lev Plimak1, Wolfgang Schleich1, and Stig Stenholm1,2,3 — 1Abteilung Quantenphysik, Universitaet Ulm, D-89069 Ulm, Germany — 2Physics Department, Royal Institute of Technology, KTH, Stockholm, Sweden — 3Laboratory of Computational Engineering, HUT, Espoo, Finland
We show that a causality violation emerges if the conventional definition of the time-normal operator ordering [1] is taken outside the rotating wave approximation. It disappears were the amended definition [2] used. Relativistic causality is demonstrated for a time-normal product of two operators under the most general assumptions about quantum dynamics.
[1] P.L.Kelly and W.H.Kleiner, Phys.Rev. 136, A316 (1964).
[2] Lev Plimak and Stig Stenholm, Annals of Physics, 323, 1989 (2008).