Fig. 4: Fidelities of the four programmed OHQE circuits.
From: Programmable photonic integrated meshes for modular generation of optical entanglement links
a Color map of ideal and experimental unitaries and the measured unitary fidelity of circuit (1). b Measured intensity at the four output pairs of Hadamard operations of circuit (1) while performing an input phase sweep. Optical inputs and outputs are labeled with the convention (A,B), where A and B are port numbers. The resulting link fidelities \(F_{ij}^ \pm\) of each input pair are displayed. c–h are the measurements in a, b but for circuits (2), (3), and (4) respectively, demonstrating 16 independent connections. The average optical link fidelity of all 32 interference curves is 0.991 ± 0.0063.
