Remote sensing of optical absorption coefficient of object, e.g. patient's body part, uses separated beams of entangled pair photons

摘要

Quantum theory states that light beams consist of pairs of photons, signal photons and idler photons; each of a pair being affected by the same event. The present application depends on the assumption that if the idlers were separated from the signal photons, they would still mirror the effects experienced by the signal photons. The output of a laser (1) is split into signal and idler beams. The signal beam (m) scans the patient (S), while the idler beam (e) is fed to a detector (I).