Designated Photons
Calcium excited by a laser and emits two photons
trigger photon turns detectors on and off (emitted and absorbed!)
designated photon demonstrated anticoincidences!
Supported the photon picture! - no wave interpretation possible
other modifications are possible to demonstrate both wave and photon properties of light - see section 45-6
- 1986 Grangier, Roger, Aspect replaced source S by beam of calcium ions