Single-shot quantitative quantum ghost polarimetric imaging

We present a single-shot quantum ghost polarimetry technique for quantitative birefringence imaging by replacing multi-orientation polarization sampling with a parallel four-analyzer readout. A single gated exposure yields a 2×2 mosaic of polarization-resolved ghost images whose relative intensities furnish the observables for per-pixel retardance and fast-axis retrieval. Idler photons of polarization-entangled biphotons probe a birefringent pattern and signal photons are routed to four analyzer channels and imaged by an intensified sCMOS as a simultaneous 2×2 mosaic. Relative intensities across the mosaic yield per-pixel retardance and fast-axis orientation. The multiplexed, correlation-based readout supports real-time, low-photon flux polarimetric microscopy and metrology of birefringence.