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Composite quantum collision models

  • Autori: Lorenzo, S.; Ciccarello, F.; Palma, G.
  • Anno di pubblicazione: 2017
  • Tipologia: Articolo in rivista (Articolo in rivista)
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A collision model (CM) is a framework to describe open quantum dynamics. In its memoryless version, it models the reservoir R as consisting of a large collection of elementary ancillas: The dynamics of the open system S results from successive collisions of S with the ancillas of R. Here, we present a general formulation of memoryless composite CMs, where S is partitioned into the very open system under study S coupled to one or more auxiliary systems Si. Their composite dynamics occurs through internal S-Si collisions interspersed with external ones involving Si and the reservoir R. We show that important known instances of quantum non-Markovian dynamics of S-such as the emission of an atom into a reservoir featuring a Lorentzian, or multi-Lorentzian, spectral density or a qubit subject to random telegraph noise-can be mapped on to such memoryless composite CMs.