Factoring the unitary evolution operator and quantifying entanglement

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

References in corpus (2)

• On the volume of the set of mixed entangled states
• Information-theoretic approach to quantum error correction and reversible measurement

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