title: Entanglement dynamics in open two-qubit systems via diffusive quantum trajectories.
abstract: We use quantum diffusive trajectories to prove that the time evolution of two-qubit entanglement under spontaneous emission can be fully characterized by optimal continuous monitoring. We analytically determine this optimal unraveling and derive a deterministic evolution equation for the system's concurrence. Furthermore, we propose an experiment to monitor the entanglement dynamics in bipartite two-level systems and to determine the disentanglement time from a single trajectory.
authors.affiliation: Departamento de Física, Universidad Nacional de Colombia, Carrera 30 No. 45-03 Edificio 404, Bogotá D.C., Colombia.
authors.forename: Carlos
authors.initials: C
authors.lastname: Viviescas
authors.forename: Ivonne
authors.initials: I
authors.lastname: Guevara
authors.forename: André R R
authors.initials: AR
authors.lastname: Carvalho
authors.forename: Marc
authors.initials: M
authors.lastname: Busse
authors.forename: Andreas
authors.initials: A
authors.lastname: Buchleitner