5 research outputs found
Entangling oscillators through environment noise
We consider two independent bosonic oscillators immersed in a common bath,
evolving in time with a completely positive, markovian, quasi-free (Gaussian)
reduced dynamics. We show that an initially separated Gaussian state can become
entangled as a result of a purely noisy mechanism. In certain cases, the
dissipative dynamics allows the persistence of these bath induced quantum
correlations even in the asymptotic equilibrium state.Comment: 14 pages, plain-Te
Open Quantum Dynamics: Complete Positivity and Entanglement
We review the standard treatment of open quantum systems in relation to
quantum entanglement, analyzing, in particular, the behaviour of bipartite
systems immersed in a same environment. We first focus upon the notion of
complete positivity, a physically motivated algebraic constraint on the quantum
dynamics, in relation to quantum entanglement, i.e. the existence of
statistical correlations which can not be accounted for by classical
probability. We then study the entanglement power of heat baths versus their
decohering properties, a topic of increasing importance in the framework of the
fast developing fields of quantum information, communication and computation.
The presentation is self contained and, through several examples, it offers a
detailed survey of the physics and of the most relevant and used techniques
relative to both quantum open system dynamics and quantum entanglement.Comment: LaTex, 77 page