  A system of two coupled cavities with $N-1$ photons is shown to be
dynamically equivalent to an array of $N$ coupled cavities containing one
photon. Every transition in the two cavity system has a dual phenomenon in
terms of photon transport in the cavity array. This duality is employed to
arrive at the required coupling strengths and nonlinearities in the cavity
array so that controlled photon transfer is possible between any two cavities.
This transfer of photons between two of the cavities in the array is effected
without populating the other cavities. The condition for perfect transport
enables perfect state transfer between any two cavities in the array. Further,
possibility of high fidelity generation of generalized NOON states in two
coupled cavities, which are dual to the Bell states of the photon in the cavity
array, is established.
