Operator ordering and causality

L. I. Plimak*, S. T. Stenholm, W. P. Schleich

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    A formal implementation of the concepts of mesoscopic electromagnetic interaction and of the propagating wave in quantum electrodynamics beyond the rotating wave approximation is discussed. Used as a guide, these concepts lead to a natural resolution of a long-standing controversy: causality violations in the Glauber-Kelley-Kleiner photodetection theory. The Glauber-Kelley-Kleiner definition of the time-normal operator ordering must be amended without the rotating wave approximation, which eliminates all causality problems.

    Original languageEnglish
    Article number014026
    JournalPhysica Scripta
    Issue numberT147
    DOIs
    Publication statusPublished - Feb 2012
    MoE publication typeA1 Journal article-refereed

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