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

By P. Haikka, T. Johnson, Sabrina Maniscalco. 2012

138 citations recorded by the source corpus.

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 parameter s 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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/1af7f5c2d60065f037efdb102953e849a533539e

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Dynamics of non-Markovian open quantum systems (2015, methodology): “In addition, Haikka et al. (2013) analyze a twolevel system subject to a dephasing bath with spectral density (26), observing that there is a critical value of s for the onset of non-Markovianity.”
Colloquium: Non-Markovian dynamics in open quantum systems (2015, background): “…2011), continous variable quantum key distribution (Vasile et al., 2011b), metrology (Chin et al., 2012), steady state entanglement (Huelga et al., 2012), Coulomb crystals (Borrelli et al., 2013), symmetry breaking (Chancellor et al., 2013), and time-invariant quantum discord (Haikka et al., 2013).”