Environment-assisted entanglement enhancement
Biplab Ghosh, A. S. Majumdar, N. Nayak · Physical Review A · 2006
We consider various dissipative atom-cavity systems and show that their collective dynamics can be used to maximize entanglement for intermediate values of the cavity leakage parameter $\ensuremath{\kappa}$. We first consider the interaction of a single two-level atom with one of two coupled microwave cavities and show analytically that the atom-cavity entanglement increases with cavity leakage. We next consider a system of two atoms passing successively through a cavity and derive the expression for the maximum value of $\ensuremath{\kappa}$ in terms of the Rabi angle $gt$, for which the two-atom entanglement can be increased. Finally, numerical investigation of micromaser dynamics also reveals the increase of two-atom entanglement with stronger cavity-environment coupling for experimentally attainable values of the micromaser parameters.