Fig. 1: Generation of entangled states of photons.
From: Realizing a deterministic source of multipartite-entangled photonic qubits
a An auxiliary quantum system A coupled to an emitter is used to generate a state \(\left|\psi \right\rangle \) of photonic modes Pi. b Quantum circuit using an initialization gate and single-qubit gates U acting on the auxiliary system A, and two-qubit gates (small squares) of the CNOT and SWAP family between the auxiliary qubit and the photons Pi. The last two-qubit gate is always a SWAP (crosses). c Specific gates used for the generation of the cluster state, the GHZ state, and the W state. H: Hadamard gate, 1: Identity gate.
