Ghost imaging: from quantum to classical to computational

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Quantum metrology and its application in biology (2014, background): “In fact, the resolution limit due to speckle is given by approximately λz/D, where z is the distance from the noisy light source to the image, and D is its diameter [99, 100].”
Single-pixel imaging 12 years on: a review. (2020, background): “Erkmen and Shapiro [50] provide a useful review of quantum, classical and computational ghost imaging.”
Roadmap on optical security (2016, methodology): “In a single-pixel secured imaging system, input information can be recovered by correlating intensity signals recorded by two detectors, and input information can be obtained at the plane where it is not located [ 135 ] .”