INVESTIGADORES
RONCAGLIA Augusto Jose
artículos
Título:
Dynamical phases for the evolution of the entanglement between two oscillators coupled to the same environment
Autor/es:
J. P. PAZ; A. J. RONCAGLIA
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
AMER PHYSICAL SOC
Referencias:
Año: 2009 vol. 79 p. 32102 - 32102
ISSN:
1050-2947
Resumen:
We study the dynamics of the entanglement between two oscillators that
are initially prepared in a general two-mode Gaussian state and evolve
while coupled to the same environment. In a previous paper, we showed
that there are three qualitatively different dynamical phases for the
entanglement in the long-time limit: sudden death, sudden death and
revival, and no sudden death [Paz and Roncaglia, Phys. Rev. Lett. 100,
220401 (2008)]. Here we generalize and extend those results along
several directions: We analyze the fate of entanglement for an
environment with a general spectral density providing a complete
characterization of the evolution for Ohmic, sub-Ohmic, and super-Ohmic
environments. We consider two different models for the interaction
between the system and the environment (one where the coupling is
through position and another where the coupling is symmetric in position
and momentum). Finally, we show that for nonresonant oscillators, the
final entanglement is independent of the initial state and may be
nonzero at very low temperatures.