Quantum Zeno effect and motional narrowing in a two-level system
1988; Optica Publishing Group; Volume: 5; Issue: 6 Linguagem: Inglês
10.1364/josab.5.001317
ISSN1520-8540
Autores Tópico(s)Quantum Mechanics and Applications
ResumoA model is given for the continual measurement of the inversion in a two-level system. The system is assumed to undergo oscillations between the two states. The effect of the measurement is determined by a Markovian master equation and one parameter Γ, which is a function of the measurement response bandwidth and the measuring device noise level. For rapid, accurate measurements, Γ is large. The two-level oscillation frequency provides a dynamical threshold. When Γ exceeds this threshold a two-level system prepared initially in the excited state remains so on a time scale of Γ. Thus, in the limit of Γ infinitely large, the dynamics is frozen. This is the Zeno effect. The relationship of this behavior to motional narrowing is discussed.
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