Chien-Shiung Wu
This can be used to derive the correlation of the quantum polarisations of the two photons. Their prediction was confirmed experimentally by Chien-Shiung Wu and I. Shaknov in 1950. This was the first experimental confirmation of a pair of entangled photons as applicable to the Einstein-Podolsky-Rosen (EPR) paradox. The result was subsequently explained by Richard Dalitz and Frank Duarte. Apparently following Dirac's doctrine, Ward was never bothered by issues of interpretation in quantum mechanics.