Eur. Phys. J. D (2014) 68: 7
https://doi.org/10.1140/epjd/e2013-40171-9

Regular Article

Witnessing non-Markovianity of quantum evolution

Institute of Physics, Nicolaus Copernicus University Grudziądzka 5/7, 87–100 Toruń, Poland

^a e-mail: darch@fizyka.umk.pl

Received: 26 March 2013
Received in final form: 22 July 2013
Published online: 23 January 2014

Abstract

We provide further characterization of non-Markovian quantum dynamics based on the concept of divisible dynamical maps. In analogy to entanglement witness we propose a non-Markovianity witness and introduce the corresponding measure of non-Markovianity. We also provide characterization of non-Markovianity in terms of Wigner-Yanase-Dyson skew information.