Abstract

Indistinguishable photons play a key role in quantum optical information technologies. We characterize the output of an ultrabright photon-pair source using multiparticle tomography [ R. B. A. Adamson et al., Phys. Rev. Lett. 98, 043601 (2007) ] and separately identify coherent errors, decoherence, and distinguishability. We demonstrate generation of high-quality indistinguishable pairs and two-photon polarization-entangled states with 99% fidelity. Using such a state we perform a super-resolving angular measurement with 90% visibility.

© 2010 Optical Society of America

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