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We report a novel Bell state preparation experiment. High-purity Bell statesare prepared by using femtosecond pulse pumped \emph{nondegenerate} collinearspontaneous parametric down-conversion. The use of femtosecond pump pulse {\emdoes not} result in reduction of quantum interference visibility in our schemein which post-selection of amplitudes and other traditional mechanisms, suchas, using thin nonlinear crystals or narrow-band spectral filters are not used.Another distinct feature of this scheme is that the pump, the signal, and theidler wavelengths are all distinguishable, which is very useful for quantumcommunications.Comment: 4 pages, submitted to PR

Bell-state preparation using pulsed nondegenerate two-photon entanglement