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Title: Relation Between Purity of an Open Qubit Dynamics and Its Initial Correlation with an Environment
Authors: Dajka, Jerzy
Gardas, Bartłomiej
Łuczka, Jerzy
Keywords: Purity; Open system; Initial correlations
Issue Date: 2013
Citation: International Journal of Theoretical Physics, Vol. 52, no. 4 (2013), s. 1148-1159
Abstract: Purity as a quantifier of an impact of environment on an open quantum system is studied for a qubit dephasingly interacting with its environment. We analyze how time evolution of the purity depends on initial states of the composite system both in the case of infinite and finite environments. It is shown that for a certain class of initial preparations, the purity of an evolving qubit state initially correlated with infinite environment can be greater than in the case of uncorrelated qubit-environment initial preparations. We identify a class of initial states leading to such desired outcome.
DOI: 10.1007/s10773-012-1430-1
ISSN: 0020-7748
Appears in Collections:Artykuły (WNŚiT)

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