A photonic unitary interferometer mesh computes QR factorization in O(N log N) operations via local power routing steps that configure the mesh to output the R factor directly.
Taguchi, Journal of the Optical Society of America B 42, 2207 (2025)
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Native QR Factorization on Programmable Photonic Meshes
A photonic unitary interferometer mesh computes QR factorization in O(N log N) operations via local power routing steps that configure the mesh to output the R factor directly.