Entanglement invariant for the double Jaynes-Cummings model
Quantum Physics
2009-11-13 v3
Abstract
We study entanglement dynamics between four qubits interacting through two isolated Jaynes-Cummings hamiltonians, via the entanglement measure based on the wedge product. We compare the results with similar results obtained using bipartite concurrence resulting in what is referred to as "entanglement sudden death". We find a natural entanglement invariant under evolution demonstrating that entanglement sudden death is caused by ignoring (tracing over) some of the system's degrees of freedom that become entangled through the interaction.
Cite
@article{arxiv.0706.3813,
title = {Entanglement invariant for the double Jaynes-Cummings model},
author = {Isabel Sainz and Gunnar Björk},
journal= {arXiv preprint arXiv:0706.3813},
year = {2009}
}