Non-Markovianity of local dephasing channels and time-invariant discord



: Haikka P, Johnson TH, Maniscalco S

Publisher: AMER PHYSICAL SOC

: 2013

: Physical Review A

: PHYSICAL REVIEW A

: PHYS REV A

: ARTN 010103

: 1

: 87

: 1

: 5

: 1050-2947

DOI: https://doi.org/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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