Touching from a distance

One frequently encounters electronic circuits like this one, but how does it work ? Try to work it out ! It is an instructive exercise !
[http://physics.aps.org/articles/v4/11]
(Top) Optical micrograph of the device used by Wang et al. [1] to entangle spatially separated photons stored in superconducting resonators. A and B label the waveguide resonators, which are entangled in the experiment. The phase qubits q₀ and q₁ are Josephson junction phase qubits, while C is a coupling resonator used to mediate the interaction between the qubits. (Bottom) Equivalent circuit schematic for the device.