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    Phys Rev Lett. 2002 Nov 25;89(22):220405. Epub 2002 Nov 8.

    Embedding dissipation and decoherence in unitary evolution schemes.

    Source

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge 70803-4001, USA. arau@phys.lsu.edu

    Abstract

    Dissipation and decoherence, and the evolution from pure to mixed states in quantum physics, are handled through master equations for the density matrix. By embedding elements of this matrix in a higher-dimensional Liouville-Bloch equation, the methods of unitary integration are adapted to solve for the density matrix as a function of time, including the nonunitary effects of dissipation and decoherence. The input requires only solutions of classical, initial value time-dependent equations. Results are illustrated for a damped, driven two-level system.

    PMID:
    12485056
    [PubMed]

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