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Quantum Electronics and Laser Science Conference

Dynamical control of quantum decay

Abraham G. Kofman, Gershon Kurizki

Published Jun 25, 2003• 0 citations
Publisher

Abstract

Summary form only given. We purport to substantially expand the arsenal of decay control, whether measurement-like (i.e., accompanied by dephasing) or fully coherent. We derive a universal form of the decay rate of unstable states into any reservoir (continuum), modified by weak perturbations with arbitrary time dependence.
DOI
10.1109/qels.2002.1031047

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A unified theory is given of dynamically modified decay and decoherence in driven quantum systems that are coupled to arbitrary finite-temperature reservoirs and undergo random phase fluctuations. Criteria for the optimization of the suppression and the limitations of this approach are obtained. Decay acceleration by frequent measurements (interruptions of the coupling), known as the anti-Zeno effect (AZE) is argued to be much more ubiquitous than its inhibition in one- or two-level systems coupled to reservoirs (continua). In multilevel systems, frequent measurements cause accelerated decay by destroying the multilevel interference, which tends to inhibit decay in the absence of measurements.