Journal
PHYSICAL REVIEW A
Volume 87, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.87.010103
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Funding
- EPSRC [EP/J016349/1]
- Finnish Cultural Foundation (Science Workshop on Entanglement)
- Emil Aaltonen foundation (Non-Markovian Quantum Information)
- Engineering and Physical Sciences Research Council [EP/J016349/1] Funding Source: researchfish
- EPSRC [EP/J016349/1] Funding Source: UKRI
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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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