Characterization of nested Walsh parity-check filters in a single-photon eight-mode register on a cloud photonic processor

arXiv:2606.18408v1 Announce Type: new Abstract: We characterize two nested Walsh parity-check filters implemented on Quandela's Belenos cloud photonic processor in a single-photon eight-mode spatial register. The modes are indexed by the vertices of the cube $Q_3$. The filters realize the classical