Abstract
A quantum collision model (CM), also known as repeated interactions model, can be built from the standard microscopic framework where a system S is coupled to a white-noise bosonic bath under the rotating wave approximation, which typically results in Markovian dynamics. Here, we discuss how to generalize the CM construction to the case of frequency-dependent system–bath coupling, which defines a class of colored-noise baths. This leads to an intrinsically non-Markovian CM, where each ancilla (bath subunit) collides repeatedly with S at different steps. We discuss the illustrative example of an atom in front of a mirror in the regime of non-negligible retardation times.
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Acknowledgements
Fruitful discussions with Susana Huelga, Kimmo Luoma, Gonzalo Manzano, Salvatore Lorenzo, and Tommaso Tufarelli are gratefully acknowledged.
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Cilluffo, D., Ciccarello, F. (2019). Quantum Non-Markovian Collision Models from Colored-Noise Baths. In: Vacchini, B., Breuer, HP., Bassi, A. (eds) Advances in Open Systems and Fundamental Tests of Quantum Mechanics. Springer Proceedings in Physics, vol 237. Springer, Cham. https://doi.org/10.1007/978-3-030-31146-9_3
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