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We show that the characterization of the quantum correlations generated by a photon-pair source can be directly performed via a classical measurement leading to an unprecedented spectral resolution and a shorter integration time.
Here we propose a new method of heralding pure single photons by the use of wave guided PDC with counter propagating photon-pairs: one travels with the pump beam while the other is back propagating towards the laser source. The wavelengths of these generated photon pairs, can be freely engineered by microstructured periodic poling of the chi-nonlinearity of the crystal and an appropriately chosen...
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