Diagnosis, prescription, and prognosis of a bell-state filter by quantum process tomography.
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.
Mitchell
M W
MW
Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7.
Ellenor
C W
CW
Schneider
S
S
Steinberg
A M
AM