A review is presented of the latest theoretical and experimental results on the generation of entangled photons with tunable quantum correlations in integrated nonlinear waveguides, based on the spontaneous parametric down-conversion in the regime of quantum walks. The possibilities to map classical amplitude and phase profiles of the pump beam to the components of a biphoton wavefunction at the output, and pump filtering in waveguides with adiabatically varying parameters, are discussed.
42.50.Ar Photon statistics and coherence theory
42.65.Lm Parametric down conversion and production of entangled photons
42.82.Et Waveguides, couplers, and arrays
Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University Canberra, ACT 0200, Australia.
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