Evolution of entanglement under echo dynamics

Details Evolution of entanglement under echo dynamics Evolution of entanglement under echo dynamics

2002-04-08

arxiv.org/abs/quant-ph/0204043v2

Phys.Rev.A 67, 042112 (2003)

Physics

Quantum Physics

5 RevTeX pages, 3 EPS figures (one color) ; v2: considerable revision ;inequality proof omitted

Scientific paper

10.1103/PhysRevA.67.042112

Echo dynamics and fidelity are often used to discuss stability in quantum information processing and quantum chaos. Yet fidelity yields no information about entanglement, the characteristic property of quantum mechanics. We study the evolution of entanglement in echo dynamics. We find qualitatively different behavior between integrable and chaotic systems on one hand and between random and coherent initial states for integrable systems on the other. For the latter the evolution of entanglement is given by a classical time scale. Analytic results are illustrated numerically in a Jaynes Cummings model.

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