Probing multipartite entanglement in a coupled Jaynes-Cummings system
Peng Xue, Z. Ficek, Barry Cyril Sanders · Physical Review A · 2012
We show how to probe multipartite entanglement in $N$ coupled Jaynes-Cummings cells where the degrees of freedom are the electronic energies of each of the $N$ atoms in separate single-mode cavities plus the $N$ single-mode fields themselves. Specifically we propose probing the combined system as though it is a dielectric medium. The spectral properties and transition rates directly reveal multipartite entanglement signatures. It is found that the Hilbert space of the $N$ cell system can be confined to the totally symmetric subspace of two states only that are maximally entangled $W$ states with $2N$ degrees of freedom.