Relaxation of a two-level system: non-negativity of density matrix and possibility for anomalously long T-2

    Authors

    A. A. Goun;B. Y. Zel'dovich

    Abbreviated Journal Title

    J. Mod. Opt.

    Keywords

    QUANTUM; Optics

    Abstract

    Density matrix equations for the relaxation of a two-level system are studied. Standard dogma, Gamma(ik) greater than or equal to (gamma(i) + gamma(k))/2, about the relaxation constant for the off-diagonal (Gamma(ik)) and diagonal (gamma(i)) matrix elements is verified for the case of up- and down-transitions with high rates w(21) and w(12). Non-negativity of the density matrix imposes much weaker limitation, Gamma(21) greater than or equal to (1/2)[(w(21))(1/2) -(w(12))(1/2)](2). An almost 'physical' system is suggested, which describes to a certain approximation such decrease of transverse relaxation constant Gamma.

    Journal Title

    Journal of Modern Optics

    Volume

    49

    Issue/Number

    3-4

    Publication Date

    1-1-2002

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    503

    Last Page

    509

    WOS Identifier

    WOS:000174012700017

    ISSN

    0950-0340

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