Dresden 2011 – scientific programme

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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 Stenholm^1,2,3 — 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).