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Temporal coherence of individual signal or idler beam, determined by thespectral correlation property of photon pairs, is important for realizingquantum interference among independent sources. To understand the effect ofchirp on the temporal coherence property, two series of experiments areinvestigated by introducing different amount of chirp into either the pulsedpump or individual signal (idler) beam. In the first one, based on spontaneousfour wave mixing in a piece of optical fiber, the intensity correlationfunction of the filtered individual signal beam, which characterizes the degreeof temporal coherence, is measured as a function of the chirp of pump. Theresults demonstrate that the chirp of pump pulses decreases the degree oftemporal coherence. In the second one, a Hong-Ou-Mandel type two-photoninterference experiment with the signal beams generated in two different fibersis carried out. The results illustrate that the chirp of individual beam doesnot change the temporal coherence degree, but affect the temporal modematching. To achieve high visibility, apart from improving the coherence degreeby minimizing the chirp of pump, mode matching should be optimized by managingthe chirps of individual beams.

Effect of chromatic dispersion induced chirp on the temporal coherence property of individual beam from spontaneous four wave mixing