Direct measurement of finite-time disentanglement induced by a reservoir
Marcelo França Santos, P. Milman, L. Davidovich +1 more
We propose a method for directly probing the dynamics of disentanglement of an initial two-qubit entangled state under the action of a reservoir. We show that it is possible to detect disentanglement, for experimentally realizable examples of decaying systems, through the measurement of a single observable, which is invariant throughout the decay. The systems under consideration may lead to either finite-time or asymptotic disentanglement. A general prescription for measuring this observable, which yields an operational meaning to entanglement measures, is proposed, and exemplified for cavity quantum electrodynamics and trapped ions.
arXiv:quant-ph/0509204•Physical Review A•Apr 27, 2006•169 citations