A Class of Quasi-Eternal Non-Markovian Pauli Channels and Their Measure

DOI10.1142/S1230161220500195zbMATH Open1480.81023arXiv2002.11452OpenAlexW3159803993MaRDI QIDQ5013211

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Publication date: 29 November 2021

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Abstract: We study a class of qubit non-Markovian general Pauli dynamical maps with multiple singularities in the generator. We discuss a few easy examples involving trigonometric or other non-monotonic time dependence of the map, and discuss in detail the structure of channels which don't have any trigonometric functional dependence. We demystify the concept of a singularity here, showing that it corresponds to a point where the dynamics can be regular but the map is momentarily non-invertible, and this gives a basic guideline to construct such non-invertible non-Markovian channels. Most members of the channels in the considered family are quasi-eternally non-Markovian (QENM), which is a broader class of non-Markovian channels than the eternal non-Markovian channels. In specific, the measure of quasi-eternal non-Markovian (QENM) channels in the considered class is shown to be $frac23$ in the isotropic case, and about 0.96 in the anisotropic case.

Full work available at URL: https://arxiv.org/abs/2002.11452

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