Dynamics of correlations due to a phase noisy laser

Bruno Bellomo, Giuseppe Compagno, Rosario Lo Franco, James D Cresser, Erika Andersson, Rosario Lo Franco

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26 Citazioni (Scopus)


We analyze the dynamics of various kinds of correlations present between two initially entangled independent qubits, each one subject to a local phase-noisy laser. We give explicit expressions for the relevant quantifiers of correlations for the general case of single-qubit unital evolution, which includes the case of a phase-noisy laser. Although the light field is treated as classical, we find that this model can describe revivals of quantum correlations. Two different dynamical regimes of decay of correlations occur, a Markovian one (exponential decay) and a non-Markovian one (oscillatory decay with revivals) depending on the values of system parameters. In particular, in the non-Markovian regime, quantum correlations quantified by quantum discord show an oscillatory decay faster than that of classical correlations. Moreover, there are time regions where nonzero discord is present while entanglement is zero.
Lingua originaleEnglish
pagine (da-a)014004-
Numero di pagine4
RivistaPhysica Scripta
Stato di pubblicazionePublished - 2012


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

Cita questo

Bellomo, B., Compagno, G., Lo Franco, R., Cresser, J. D., Andersson, E., & Franco, R. L. (2012). Dynamics of correlations due to a phase noisy laser. Physica Scripta, 2012, 014004-.