We use quantum scattering theory to study a fixed quantum system Y subject to collisions with massive
particles X described by wave packets. We derive the scattering map for system Y and show that the
induced evolution crucially depends on the width of the incident wave packets compared to the level
spacing in Y. If Y is nondegenerate, sequential collisions with narrow wave packets cause Y to decohere.
Moreover, an ensemble of narrow packets produced by thermal effusion causes Y to thermalize. On the
other hand, broad wave packets can act as a source of coherences for Y, even in the case of an ensemble
of incident wave packets given by the effusion distribution, preventing thermalization. We illustrate our
findings on several simple examples and discuss the consequences of our results in realistic experimental
situations.
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Patrocinador
dc.description.sponsorship
Doctoral Training Unit on Materials for Sensing and Energy Harvesting (MASSENA) FNR PRIDE/15/10935404
European Research Council (ERC)
European Commission 681456
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT 1191441
National Science Foundation (NSF) NSF PHY-1748958
Spanish Government
European Commission FIS-2017-83706-R
Foundational Questions Institute Fund, a donor advised fund of Silicon Valley Community Foundation FQXi-IAF19-01
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Lenguage
dc.language.iso
en
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Publisher
dc.publisher
American Physical Society
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Type of license
dc.rights
Attribution-NonCommercial-NoDerivs 3.0 United States