Master equation for cascade quantum channels: a collisional approach

Abstract

It has been recently shown that collisional models can be used to derive a general form for the master equations which describe the reduced time evolution of a composite multipartite quantum system, whose components "propagate" in an environmental medium which induces correlations among them via a cascade mechanism. Here we analyze the fundamental assumptions of this approach showing how some of them can be lifted when passing into a proper interaction picture representation.

19 pages, 3 figures. This paper contains an extended version of the supplementary material of Phys. Rev. Lett. 108, 040401 (2012) -- see arXiv:1105.4506

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