Clements Decomposition Achieved on Programmable Photonic Processor

A successful Clements decomposition was achieved on a programmable photonic processor built from silicon-nitride, demonstrating a functional outcome enabled by a newly introduced calibration method. Researchers at the Emmy-Noether Group Theoretical Quantum Systems Design, Technical University of Munich, have introduced a method that bypasses common hurdles in photonic systems by utilizing intensity-only measurements for calibration. This approach eliminates the need for node isolation, dedicated routing paths, orthogonal training states, reference channels, or prior phase and voltage characterization, all of which become increasingly difficult in large thermally tuned meshes. The work establishes local output variance as a calibration observable…