title: Diagnosis, prescription, and prognosis of a bell-state filter by quantum process tomography.
abstract: We apply the techniques of quantum process tomography to characterize errors and decoherence in a prototypical two-photon operation, a singlet-state filter. The quantum process tomography results indicate a large asymmetry in the process and also the required operation to correct for this asymmetry. We quantify residual errors and decoherence of the filtering operation after this modification.
authors.affiliation: Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7.
authors.forename: M W
authors.initials: MW
authors.lastname: Mitchell
authors.forename: C W
authors.initials: CW
authors.lastname: Ellenor
authors.forename: S
authors.initials: S
authors.lastname: Schneider
authors.forename: A M
authors.initials: AM
authors.lastname: Steinberg