Linear optical quantum computation with imperfect entangled photon-pair sources andinefficient non-photon-number-resolving detectors

摘要

We propose a scheme for efficient cluster state quantum computation by using imperfect polarization-entangledphoton-pair sources, linear optical elements, and inefficient non-photon-number-resolving detectors. Theefficiency threshold for loss tolerance in our scheme requires the product of source and detector efficienciesshould be > 1/2, the best known figure. This figure applies to uncorrelated loss. We further find that the lossthreshold is unaffected by correlated loss in the photon pair source. Our approach sheds new light on efficientlinear optical quantum computation with imperfect experimental conditions.