One-photon and two-photon wavepackets of entangled two-photon states in spontaneous parametric down-conversion (SPDC) fields are calculated and measured experimentally. For type-II SPDC, measured one-photon and two-photon wavepackets agree well with theory. For type-I SPDC, the measured one-photon wavepacket agree with the theory. However, the two-photon wavepacket is much bigger than the expected value and the visibility of interference is low. We identify the sources of this discrepancy as the spatial filtering of the two-photon bandwidth and non-pair detection events caused by the detector apertures and the tuning curve characteristics of the type-I SPDC.
@article{arxiv.quant-ph/0304181,
title = {Measurement of one-photon and two-photon wavepackets in spontaneous parametric down-conversion},
author = {Yoon-ho Kim},
journal= {arXiv preprint arXiv:quant-ph/0304181},
year = {2009}
}
Comments
8 pages, two-column, to appear in J. Opt. Soc. Am. B