Fig. 3: Optically-heralded quantum entanglement (OHQE) circuit configurations.
From: Programmable photonic integrated meshes for modular generation of optical entanglement links
a–d OHQE circuit diagrams labeled (1)–(4) with error-corrected crossing gates for the four circuits. Each circuit routes a pair of inputs to the output Hadamard gates, enabling photon-mediated quantum entanglement protocols. e Connectivity generated between the 8 inputs using circuits (1)–(4), forming a cubic lattice unit cell. Connections between inputs (1,4), (2,3), (5,8), and (6,7) are optional for the purposes of generating the unit cell.
