Coherent intermittency in the resonant fluorescence of a multilevel atom

M. Porrati, S. Putterman

    Research output: Contribution to journalArticlepeer-review


    Time correlations in the fluorescence of a multilevel atom are studied in terms of the quantum statistics which describe the emission of the next photon. The next photon equations are substantially simpler than the a photon equations (or so-called optical Bloch equations) yet they contain phase information lost in the averaging procedure that yields the a photon equations. Employing the next photon equations we present a quantum formalism in which the time development of the wave function of the atom is dramatically modified by the observation of a dark period. This collapse of the quantum state due to measurements with a null result (such as the failure to record events in a photodetector) is the cause of intermittent atomic fluorescence even when the exciting field is arbitrarily coherent. The next photon and a photon formalisms are contrasted and applied to photon antibunching. The phenomenon of photon bunching which characterizes sideband correlations is also calculated. Observable effects particular to the coherent intermittency are emphasized.

    Original languageEnglish (US)
    Pages (from-to)3010-3030
    Number of pages21
    JournalPhysical Review A
    Issue number6
    StatePublished - 1989

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics


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