Quantum Logic with Cavity Photons From Single Atoms
Annemarie Holleczek, Oliver Barter, Allison Rubenok, Jerome Dilley, Peter B. R. Nisbet-Jones, Gunnar Langfahl-Klabes, Graham D. Marshall, Chris Sparrow, Jeremy L. O’Brien, Konstantinos Poulios, Axel Kuhn, Jonathan C. F. Matthews · Physical Review Letters · 2016
We demonstrate quantum logic using narrow linewidth photons that are produced with an a priori nonprobabilistic scheme from a single ^{87}Rb atom strongly coupled to a high-finesse cavity. We use a controlled-not gate integrated into a photonic chip to entangle these photons, and we observe nonclassical correlations between photon detection events separated by periods exceeding the travel time across the chip by 3 orders of magnitude. This enables quantum technology that will use the properties of both narrow-band single photon sources and integrated quantum photonics.