Fig. 2: Principle of JPD pixel super-resolution.
From: Pixel super-resolution with spatially entangled photons
a Schematic of the optical imaging system composed of an object t illuminated by entangled photon pairs with correlation width σ and imaged onto an array of pixels. Δ and δ are pixel pitch and gap, respectively. Positions at the center of pixels are noted using an integer indices i.e. xk, while those between pixels are noted using half-integer indices i.e. xk+1/2. Blue rays represent some photon pairs falling on a single pixel and red rays some falling on two nearest-neighbor pixels. b, c Unidimensional images formed by JPD diagonal elements Γkk and off-diagonal elements Γkk+1, respectively. d Performing a sum-coordinate projection of the JPD using equation (1) recombines these two low-resolution images into a high-resolution one.
