Phase-space quantum profile of Pöschl-Teller two-level systems
Departamento de Física, Universidade Federal de São Carlos, PO Box 676, 13565-905, São Carlos, SP, Brazil
2 Centro de Matemática, Computação e Cognição, Universidade Federal do ABC - UFABC, 09210-580, Santo André, Brazil
* e-mail: email@example.com
Accepted: 27 November 2018
Published online: 17 January 2019
The quantum phase-space dynamics driven by hyperbolic Pöschl-Teller (PT) potentials is investigated in the context of the Weyl-Wigner quantum mechanics. The obtained Wigner functions for quantum superpositions of ground and first excited states exhibit some non-classical and non-linear patterns which are theoretically tested and quantified according to a non-Gaussian continuous variable framework. It comprises the computation of quantifiers of non-classicality for an anharmonic two-level system where non-Liouvillian features are identified through the phase-space portrait of quantum fluctuations. In particular, the associated non-Gaussian profiles are quantified by measures of kurtosis and negative entropy. As expected from the PT quasi-harmonic profile, our results suggest that quantum wells can work as an experimental platform that approaches the Gaussian behavior in the investigation of the interplay between classical and quantum scenarios. Furthermore, it is also verified that the Wigner representation admits the construction of a two-particle bipartite quantum system of continuous variables, A and B , which are shown to be separable under Gaussian and non-Gaussian continuous variable criteria.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2019