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.

Lorenzo, S., Ciccarello, F., Palma, G. (2017). Composite quantum collision models. PHYSICAL REVIEW A, 96(3) [10.1103/PhysRevA.96.032107].

Composite quantum collision models

Lorenzo, S.;CICCARELLO, Francesco;PALMA, Gioacchino Massimo
2017-09-01

Abstract

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.
set-2017
Lorenzo, S., Ciccarello, F., Palma, G. (2017). Composite quantum collision models. PHYSICAL REVIEW A, 96(3) [10.1103/PhysRevA.96.032107].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/242632
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