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Biomedical subjects

Paul Brumer

Publications and source records attributed to Paul Brumer.

4 recordsLinked to original sources
PubMed2003

When is quantum decoherence dynamics classical?

A direct classical analog of quantum decoherence is introduced. Similarities and differences between decoherence dynamics examined quantum mechanically and classically are exposed via a second-order perturbative treatment and via a strong decoherence theory, showing a strong dependence on the nature of the system-environment coupling. For example, for the traditionally assumed linear coupling, the classical and quantum results are shown to be in exact agreement.

Journal Article↗
PubMed2002

Coherent control in the presence of intrinsic decoherence: proton transfer in large molecular systems.

An efficient semiclassical approach is developed and used to calculate the coherent-control map and time dependent decoherence measure for the excited-state proton transfer dynamics associated with the keto-enolic tautomerization reaction of 2-(2'-hydroxyphenyl)-oxazole. The method extends the usual bichromatic coherent-control scenario to simulate control at finite times after photoexcitation of the system. Extensive coherent control is demonstrated in a large molecule despite the ultrafast decoherence phenomena, providing results of broad theoretical and experimental interest.

Journal Article↗
PubMed2002

Phase control of nonadiabaticity-induced quantum chaos in an optical lattice.

The qualitative nature (i.e., integrable vs chaotic) of the translational dynamics of a three-level atom in an optical lattice is shown to be controllable by varying the relative laser phase of two standing-wave lasers. Control is explained in terms of the nonadiabatic transition between optical potentials and the corresponding regular-to-chaotic transition in mixed classical-quantum dynamics. The results are of interest to both areas of coherent control and quantum chaos.

Journal Article↗