Factoring the unitary evolution operator and quantifying entanglement
arXiv:quant-ph/0003024 · doi:10.1016/S0375-9601(99)00609-X
Abstract
The unitary evolution can be represented by a finite product of exponential operators. It leads to a perturbative expression of the density operator of a close system. Based on the perturbative expression scheme, we present a entanglement measure, this measure has the advantage that it is easy to compute for a general dynamical process.
11 pages, LATEX, no figures