SSP-QST: Spectral Subspace Purification for Photonic Quantum State Tomography

Anuvab Sen, Saibal Mukhopadhyay

Photonic quantum sensing often uses low-rank entangled probes such as Greenberger-Horne-Zeilinger (GHZ), Bell, and NOON states. Although these probes are ideally rank-1, practical…