A1 Refereed original research article in a scientific journal
Non-Markovianity of local dephasing channels and time-invariant discord
Authors: Haikka P, Johnson TH, Maniscalco S
Publisher: AMER PHYSICAL SOC
Publication year: 2013
Journal: Physical Review A
Journal name in source: PHYSICAL REVIEW A
Journal acronym: PHYS REV A
Article number: ARTN 010103
Number in series: 1
Volume: 87
Issue: 1
Number of pages: 5
ISSN: 1050-2947
DOI: https://doi.org/10.1103/PhysRevA.87.010103
Abstract
We study non-Markovianity and information flow for qubits experiencing local dephasing with an Ohmic class spectrum. We demonstrate the existence of a temperature-dependent critical value of the Ohmicity parameters for the onset of non-Markovianity and give a physical interpretation of this phenomenon by linking it to the form of the reservoir spectrum. We demonstrate that this link holds also for more general spectra. We unveil a class of initial states for which discord is forever frozen at a positive value. We connect time-invariant discord to non-Markovianity and propose a physical system in which it could be observed. DOI: 10.1103/PhysRevA.87.010103
We study non-Markovianity and information flow for qubits experiencing local dephasing with an Ohmic class spectrum. We demonstrate the existence of a temperature-dependent critical value of the Ohmicity parameters for the onset of non-Markovianity and give a physical interpretation of this phenomenon by linking it to the form of the reservoir spectrum. We demonstrate that this link holds also for more general spectra. We unveil a class of initial states for which discord is forever frozen at a positive value. We connect time-invariant discord to non-Markovianity and propose a physical system in which it could be observed. DOI: 10.1103/PhysRevA.87.010103
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