Direct measurement of finite-time disentanglement induced by a reservoir

Details Direct measurement of finite-time disentanglement induced by a reservoir Direct measurement of finite-time disentanglement induced by a reservoir

2005-09-29

arxiv.org/abs/quant-ph/0509204v2

Phys. Rev. A 73, 040305(R) (2006) (4 pages)

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevA.73.040305

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.

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