Entanglement invariant for the double Jaynes-Cummings model

Details Entanglement invariant for the double Jaynes-Cummings model Entanglement invariant for the double Jaynes-Cummings model

2007-06-26

arxiv.org/abs/0706.3813v3

Phys. Rev. A 76, 042313 (2007)

Physics

Quantum Physics

Sec. V has largely been rewritten. An error pertaining to the entanglement invariant has been corrected and a correct invarian

Scientific paper

10.1103/PhysRevA.76.042313

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.

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