Phase-covariant mixtures of non-unital qubit maps

Autor:	Katarzyna Siudzińska
Rok vydání:	2022
Předmět:	Statistics and Probability Quantum Physics Modeling and Simulation FOS: Physical sciences General Physics and Astronomy Statistical and Nonlinear Physics Mathematical Physics (math-ph) Quantum Physics (quant-ph) Computer Science::Databases Mathematical Physics
Zdroj:	Journal of Physics A: Mathematical and Theoretical. 55:405303
ISSN:	1751-8121 1751-8113
DOI:	10.1088/1751-8121/ac909b
Popis:	We analyze convex combinations of non-unital qubit maps that are phase-covariant. In particular, we consider the behavior of maps that combine amplitude damping, inverse amplitude damping, and pure dephasing. We show that mixing non-unital channels can result in restoring the unitality, whereas mixing commutative maps can lead to non-commutativity. For the convex combinations of Markovian semigroups, we prove that classical uncertainties cannot break quantum Markovianity. Moreover, contrary to the Pauli channel case, the semigroup can be recovered only by mixing two other semigroups.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bc94d465c74ba3b6901d55945fbbc469 https://doi.org/10.1088/1751-8121/ac909b Zobrazit plný text záznamu