Spatiotemporal correlations in entangled photons generated by spontaneous parametric down conversion
arXiv:0804.2425 · doi:10.1088/1367-2630/10/11/113012
Abstract
In most configurations aimed at generating entangled photons based on spontaneous parametric down conversion (SPDC), the generated pairs of photons are required to be entangled in only one degree of freedom. Any distinguishing information coming from the other degrees of freedom that characterize the photon should be suppressed to avoid correlations with the degree of freedom of interest. However, this suppression is not always possible. Here, we show how the frequency information available affects the purity of the two-photon state in space, revealing a correlation between the frequency and the space degrees of freedom. This correlation should be taken into account to calculate the total amount of entanglement between the photons.
12 pages, 5 figures.Comparison between theoretical model and previous experiment was added. One new figure, and two more references. Submitted to New Journal of Physics
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- Down-conversion source of positively spectrally correlated and decorrelated photon pairs at telecom wavelength
- Generalized description of the spatio-temporal biphoton State in spontaneous parametric down-conversion
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- Spectral Properties of Transverse Laguerre-Gauss Modes in Parametric Down-Conversion
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- Frequency correlation requirements on the biphoton wavefunction in an induced coherence experiment between separate sources
- Spatial and temporal characteristics of spontaneous parametric down-conversion with varying focal planes of interacting beams
- Spatial correlations in four-wave mixing with structured light
- A quantum-enhanced wide-field phase imager
- Bandwidth control of the biphoton wavefunction exploiting spatio-temporal correlations