A quantum computer based on optical processes requires a source of entangled photons that can be delivered efficiently on demand. Such a source has now been developed: it involves a compact light-emitting diode with an embedded quantum dot that can be driven electrically to generate entangled photon pairs.
C. L. Salter, R. M. Stevenson, I. Farrer, C. A. Nicoll, D. A. Ritchie & A. J. Shields
