  The realization of the strong coupling regime is requisite for implementing
quantum information tasks. Here, a method for enhancing the atom-field coupling
in highly dissipative coupled cavities is proposed. By introducing parametric
squeezing into the primary cavity which is only virtually excited under
specific parametric conditions, coupling enhancement between atom and auxiliary
cavity is realized for proper squeezing parameters. This enables the system to
be robust against large cavity decay and atomic spontaneous emission. The
observation of vacuum Rabi oscillations show that the originally weak-coupled
system can be enhanced into effective strong coupling regime.
