Rabi oscillations in a qubit coupled to a quantum two-level system

Sahel Ashhab, J. R. Johansson, Franco Nori

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Abstract

We consider the problem of a qubit driven by a harmonically oscillating external field while it is coupled to a quantum two-level system (TLS). We perform a systematic numerical analysis of the problem by varying the relevant parameters. The numerical calculations agree with the predictions of a simple intuitive picture, namely one that takes into consideration the four-level energy spectrum, the simple principles of Rabi oscillations and the basic effects of decoherence. Furthermore, they reveal a number of other interesting phenomena. We provide explanations for the various features that we observe in the numerical calculations and discuss how they can be used in experiment. In particular, we suggest an experimental procedure to characterize an environment of TLSs.

Original languageEnglish
Article number103
JournalNew Journal of Physics
Volume8
DOIs
Publication statusPublished - 26 Jun 2006
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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