Interaction free and decoherence free states

Anna Napoli, Antonino Messina, Marina Guccione, Dariusz Chruściński, Paweł Nalezyty, Anna Napoli, Marina Guccione, Antonino Messina

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An interaction free evolving state of a closed bipartite system composed of two interacting subsystems is a generally mixed state evolving as if the interaction were a c-number. In this paper we find the characteristic equation of states possessing similar properties for a bipartite systems governed by a linear dynamical equation whose generator is sum of a free term and an interaction term. In particular in the case of a small system coupled to its environment, we deduce the characteristic equation of decoherence free states namely mixed states evolving as if the interaction term were effectively inactive. Several examples illustrate the applicability of our theory in different physical contexts.
Original languageEnglish
Number of pages7
JournalPhysica Scripta
Publication statusPublished - 2015

All Science Journal Classification (ASJC) codes

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


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