  We propose a method to generate path-entangled $N00N$-state photons from
quantum dots (QDs) and coupled nanocavities. In the systems we considered,
cavity mode frequencies are tuned close to the biexciton two-photon resonance.
Under appropriate conditions, the system can have the target $N00N$ state in
the energy eigenstate, as a consequence of destructive quantum interference.
The $N00N$ state can be generated by the resonant laser excitation. This
method, first introduced for two-photon $N00N$ state ($N=2$), can be extended
toward higher $N00N$ state ($N>2$) based on our recipe, which is applied to the
case of $N=4$ as an example.
