NOON states from cavity-enhanced down-conversion: high quality and super-resolution
Florian Wolfgramm, Alessandro Ceré, Morgan W. Mitchell · Journal of the Optical Society of America B · 2010
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.