  We theoretically investigate the problem of localization control of
few-photon states in driven-dissipative parity-symmetric photonic molecules. We
show that a quantum feedback loop can utilize the information of the
spontaneously-emitted photons from each cavity to induce asymmetric photon
population in the system, while maintaining a balanced pump that respects
parity symmetry. To better understand the system's behaviour, we characterize
the degree of asymmetry as a function of the coupling between the two optical
cavities. Contrary to intuitive expectations, we find that in some regimes the
coupling can enhance the population asymmetry. We also show that these results
are robust against experimental imperfections and limitations such as detection
efficiency.
