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Thermalization of radiation by contact to matter is a well-known concept, butthe application of thermodynamic methods to complex quantum states of lightremains a challenge. Here we observe Bose-Einstein condensation of photons intothe hybridized ground state of a four-site ring potential with coherent tunnelcouplings. In our experiment, the periodically-closed ring lattice superimposedby a weak harmonic trap for photons is realized inside a spatially structureddye-filled microcavity. Photons thermalize to room temperature, and above acritical photon number macroscopically occupy the symmetric linear combinationof the site eigenstates with zero phase winding, which constitutes the groundstate of the system. The mutual phase coherence of photons at different latticesites is verified by optical interferometry.

Bose-Einstein Condensation of Photons in a Four-Site Quantum Ring