Measurement-driven dynamics for a coherently-excited atom

Andrew J. T. Colin, Stephen M. Barnett, John Jeffers

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The phenomenon of telegraphing in a measurement-driven two-level atom was noted in Cresser et al. [Cresser, J.D.; Barnett, S.M.; Jeffers, J.; Pegg, D.T. Opt. Commun. 2006, 264, 352361]. Here we introduce two quantitative measures of telegraphing: one based on the accumulated measurement record and one on the evolution of the quantum state. We use these to analyse the dynamics of the atom over a wide range of parameters. We find, in particular, that the measures provide broadly similar statistics when the measurements are frequent, but differ widely when measurements are sparse. This is in line with intuition, and demonstrates the utility of both measures.

Original languageEnglish
Pages (from-to)1803-1815
Number of pages13
JournalJournal of Modern Optics
Issue number21
Early online date22 Nov 2012
Publication statusPublished - 2012


  • master equations
  • Lindblad form
  • Markov processes
  • telegraphing
  • Rabi cycle
  • two-state atoms
  • imperfect measurements


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