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One-photon and two-photon wavepackets of entangled two-photon states inspontaneous parametric down-conversion (SPDC) fields are calculated andmeasured experimentally. For type-II SPDC, measured one-photon and two-photonwavepackets agree well with theory. For type-I SPDC, the measured one-photonwavepacket agree with the theory. However, the two-photon wavepacket is muchbigger than the expected value and the visibility of interference is low. Weidentify the sources of this discrepancy as the spatial filtering of thetwo-photon bandwidth and non-pair detection events caused by the detectorapertures and the tuning curve characteristics of the type-I SPDC.Comment: 8 pages, two-column, to appear in J. Opt. Soc. Am.

Measurement of one-photon and two-photon wave packets in spontaneous parametric downconversion