Classes of Exactly Solvable Generalized Semi-Classical Rabi Systems

Roberto Grimaudo*, Antonio Sérgio Magalhães de Castro, Hiromichi Nakazato, Antonino Messina

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


The exact quantum dynamics of a single spin-1/2 in a generic time-dependent classical magnetic field are investigated and compared with the quantum motion of a spin-1/2 studied by Rabi and Schwinger. The possibility of regarding the scenario studied here as a generalization of that considered by Rabi and Schwinger is discussed and the notion of a time-dependent resonance condition is introduced and carefully legitimated and analyzed. Several examples help to disclose analogies and departures of the quantum motion induced in a generalized Rabi system with respect to that exhibited by the spin-1/2 in a magnetic field precessing around the z-axis. It is found that, under a generalized resonance condition, the time evolution of the transition probability (Formula presented.) between the two eigenstates of (Formula presented.) may be dominated by a regime of distorted oscillations, or may even exhibit a monotonic behavior. At the same time, the authors succeed in predicting asymptotic behaviors with no oscillations in the time-dependence of (Formula presented.) under general conditions. New scenarios of experimental interest originating a Landau–Zener transition are brought to light.

Original languageEnglish
Article number1800198
JournalAnnalen der Physik
Issue number12
Publication statusPublished - 2018 Dec


  • exact single-qubit dynamics
  • exactly solvable time-dependent models
  • semiclassical Rabi model

ASJC Scopus subject areas

  • General Physics and Astronomy


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