Entanglement on demand

One of the problems in quantum information processing is inefficiency. Photon entanglement is generally considered a leading candidate for quantum computing (it is used for teleportation and cryptography), but right now it is sort of a hit and miss proposition. “The only methods we have for generating entangled photons are random,” Yosi Avron tells PhysOrg.com. “You don’t always get an entangled pair, and when you do, after you test the photons, they are useless.”