Spin squeezing and entanglement in a dispersive cavity
Ram Narayan Deb, M. Sebawe Abdalla, S. S. Hassan, N. Nayak · Physical Review A · 2006
We consider a system of $N$ two-level atoms (spins) interacting with the radiation field in a dispersive but high-$Q$ cavity. Under an adiabatic condition, the interaction Hamiltonian reduces to a function of spin operators which is capable of producing spin squeezing. For a bipartite system $(N=2)$, the expressions for spin squeezing get very simple, giving a clear indication of close to 100% noise reduction. We analyse this squeezing as a measure of bipartite entanglement.