Measurement of one-photon and two-photon wavepackets in spontaneous parametric down-conversion

Details Measurement of one-photon and two-photon wavepackets in spontaneous parametric down-conversion Measurement of one-photon and two-photon wavepackets in spontaneous parametric down-conversion

2003-04-28

arxiv.org/abs/quant-ph/0304181v1

J. Opt. Soc. Am. B vo. 20, p. 1959 (2003).

Physics

Quantum Physics

8 pages, two-column, to appear in J. Opt. Soc. Am. B

Scientific paper

10.1364/JOSAB.20.001959

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.

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