Producing large-scale entangled photonic states is central to quantum technologies. Deterministic emitter-based schemes that sequentially generate entangled photons have emerged as a leading route, but errors accumulated in the emitters fundamentally limit the attainable size of the resulting photonic states. We incorporate quantum error correction (QEC) into such a deterministic photonic source, actively protecting it during entanglement generation. We consider a circuit-QED architecture in which a repetition code of stabilized cat cavities stores the logical state while a transmon emits photonic qubits. We analyze the generation of both photonic GHZ and cluster states using this source and show that error correction can considerably improve photonic-state fidelity in experimentally relevant regimes. These results demonstrate that matter-based QEC can realize an error-resilient logical photon source, enabling more scalable generation of photonic entanglement.

Pizza and drinks will be served after the seminar in ATL 2117.