title: Universal and optimal error thresholds for measurement-based entanglement purification.
abstract: We investigate measurement-based entanglement purification protocols (EPP) in the presence of local noise and imperfections. We derive a universal, protocol-independent threshold for the required quality of the local resource states, where we show that local noise per particle of up to 24% is tolerable. This corresponds to an increase of the noise threshold by almost an order of magnitude, based on the joint measurement-based implementation of sequential rounds of few-particle EPP. We generalize our results to multipartite EPP, where we encounter similarly high error thresholds.
authors.affiliation: Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Zwerger
authors.forename: H J
authors.initials: HJ
authors.lastname: Briegel
authors.forename: W
authors.initials: W
authors.lastname: Dür