The paper presents a significant advancement in the realization of fractional quantum Hall (FQH) states using interacting photons on a programmable, on-chip platform. The authors demonstrate a lattice version of photon FQH states by engineering gauge fields and implementing photon blockade in a novel two-dimensional circuit quantum electrodynamics (QED) system. They observe the effective photon Lorentz force and butterfly spectrum, which are prerequisites for FQH states. After adiabatically assembling the Laughlin FQH wavefunction of 1/2 filling factor from localized photons, they detect strong density correlations and chiral topological flow among the FQH photons. The unique features of FQH states, such as incompressibility and fractional quantum Hall conductivity, are verified in response to external fields. This work opens up possibilities for fault-tolerant quantum information devices by providing a bottom-up approach to creating and manipulating novel strongly correlated topological quantum matter composed of photons.The paper presents a significant advancement in the realization of fractional quantum Hall (FQH) states using interacting photons on a programmable, on-chip platform. The authors demonstrate a lattice version of photon FQH states by engineering gauge fields and implementing photon blockade in a novel two-dimensional circuit quantum electrodynamics (QED) system. They observe the effective photon Lorentz force and butterfly spectrum, which are prerequisites for FQH states. After adiabatically assembling the Laughlin FQH wavefunction of 1/2 filling factor from localized photons, they detect strong density correlations and chiral topological flow among the FQH photons. The unique features of FQH states, such as incompressibility and fractional quantum Hall conductivity, are verified in response to external fields. This work opens up possibilities for fault-tolerant quantum information devices by providing a bottom-up approach to creating and manipulating novel strongly correlated topological quantum matter composed of photons.