Typical Behavior of the Global Entanglement of an Open Multiqubit System in a Non-Markovian Regimen

• Autores: Majtey, A. P.; Plastino, Ángel Ricardo
• Año de publicación: 2012
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: DECOHERENCE; ENTANGLEMENT; NON-MARKOVIAN DYNAMICS
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

We investigate the decay of the global entanglement, due to decoherence, of multiqubit systems interacting with a reservoir in a non-Markovian regime. We assume that during the decoherence process each qubit of the system interacts with its own, independent environment. Most previous works on this problem focused on particular initial states or families of initial states amenable of analytical treatment. Here we determine numerically the typical, average behavior of the system corresponding to random initial pure states uniformly distributed (in the whole Hilbert space of n-qubit pure states) according to the Haar measure. We study systems consisting of 3, 4, 5, and 6 qubits. In each case we consider also the entanglement dynamics corresponding to important particular initial states, such as the GHZ states or multiqubit states maximizing the global entanglement, and determine in which cases any of these states is representative of the average behavior associated with general initial states.
Fil: Majtey, A. P.. Universidad de Granada; España
Fil: Plastino, Ángel Ricardo. Universidad Nacional de La Plata; Argentina. Universidad de Granada; España. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina