Work

Competition between memory-keeping and memory-erasing decoherence channels

Year: 2014

Type: article

Abstract: We study the competing effects of simultaneous Markovian and non-Markovian decoherence mechanisms acting on a single spin. We show the existence of a threshold in the relative strength of such mechanisms above which the spin dynamics becomes fully Markovian, as revealed by the use of several non-Markovianity measures. We identify a measure-dependent nested structure of such thresholds, hinting at a causality relationship among the various non-Markovianity witnesses used in our analysis. Our considerations are then used to argue the unavoidably non-Markovian evolution of a single-electron quantum dot exposed to both intrinsic and Markovian technical noise, the latter of arbitrary strength.

Source: Physical Review A

DOI: 10.1103/physreva.90.012310

Authors: Tony J. G. Apollaro, Salvatore Lorenzo, Carlo Di Franco, Francesco Plastina, Mauro Paternostro