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We experimentally study the generation of photon pairs via spontaneousfour-wave mixing with two distinct laser pulses. We find that the dual-pumptechnique enables new capabilities: 1) a new characterization methodology tomeasure noise contributions, source brightness and photon collectionefficiencies directly from raw photon-count measurements; 2) an enhancedability to generate heralded single photons in a pure quantum state; and 3) theability to derive upper and lower bounds on heralded-photon quantum statepurity from measurements of photon-number statistics even in the presence ofnoise. Such features are highly valuable in photon-pair sources for quantumapplications.

Dual-Pump Approach to Photon-Pair Generation: Demonstration of Enhanced Characterization and Engineering Capabilities