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Diagnosis, prescription, and prognosis of a bell-state filter by quantum process tomography
M W Mitchell1, C W Ellenor, S Schneider
1Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7.
Physical Review Letters
|October 4, 2003
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.

