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We demonstrate a new generation mechanism for polarisation- andcolour-entangled photon pairs. In our approach we tailor the phase-matching ofa periodically poled KTP crystal such that two downconversion processes takeplace simultaneously. Relying on this effect, our source emits entangledbipartite photon states, emerging intrinsically from a single, unidirectionallypumped crystal with uniform poling period. Its property of being maximallycompact and luminous at the same time makes our source unique compared toexisting photon-entanglement sources and is therefore of high practicalsignificance in quantum information experiments.

A novel single-crystal & single-pass source for polarisation- and colour-entangled photon pairs