Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology
Q 16.1: Poster
Monday, March 17, 2014, 16:30–18:30, Spree-Palais
Quantum states with maximal memory effects — •Steffen Wißmann1, Antti Karlsson2, Elsi-Mari Laine2, Jyrki Piilo2, and Heinz-Peter Breuer1 — 1Physikalisches Institut, Universität Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany — 2Turku Centre for Quantum Physics, University of Turku, Finland
Perfect isolation of any quantum system is almost impossible to realize since it is usually influenced by the coupling to an environment. The most prominent approach, which takes the interaction into account, resorts to an approximation of the open system dynamics in terms of a so-called Markovian master equation. Recently, there has been put much effort in completely classifying open system dynamics. One of the approaches to define non-Markovian evolutions is based on the exchange of information between the open system and its environment [1]. The associated measure relates the degree of memory effects to a certain pair of optimal initial state pairs featuring a maximal flow of information from the environment back to the open system. Here, we present the latest results on the non-Markovianity measure proposed in [1] regarding the mathematical and physical properties of optimal pairs maximizing this quantity [2]. In addition, we derive a new, convenient representation of the measure for finite-dimensional systems showing locality and universality of memory effects of the dynamical map.
[1] H.-P. Breuer, E.-M. Laine and J. Piilo, Phys. Rev. Lett. 103, 210401 (2009)
[2] S. Wißmann, A. Karlsson, E.-M. Laine, J. Piilo and H.-P. Breuer, Phys. Rev. A 86, 062108 (2012)