Quantum correlated imaging (also known as quantum ghost imaging) utilizes the second-order correlation properties of correlated photon pairs to reconstruct images of objects that are invisible using classical single-path techniques.

The system utilizes spontaneous parametric down-conversion (SPDC) in nonlinear crystals to generate correlated photon pairs. The photons are split into two optical paths: the "object arm," where photons interact with the target object and are collected by a single-pixel bucket detector without spatial resolution; and the "reference arm," where photons do not interact with the object and are spatially scanned. Cross-correlation calculations between the two paths then reconstruct the object's image. With high brightness and clear physical principles, this system is ideal for university experimental courses in quantum imaging and quantum precision measurement.