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Integrated quantum optics becomes a consequent tendency towards practicalquantum information processing. Here, we report the on-chip generation andmanipulation of photonic entanglement based on reconfigurable lithium niobatewaveguide circuits. By introducing periodically poled structure into thewaveguide interferometer, two individual photon-pair sources with controllablephase-shift are produced and cascaded by a quantum interference, resulting in adeterministically separated identical photon pair. The state is characterizedby 92.9% visibility Hong-Ou-Mandel interference. Continuous morphing fromtwo-photon separated state to bunched state is further demonstrated by on-chipcontrol of electro-optic phase-shift. The photon flux reaches ~1.4*10^7 pairsnm-1 mW-1. Our work presents a scenario for on-chip engineering of differentphoton sources and paves a way to the fully integrated quantum technologies.

Reconfigurable on-chip entangled sources based on lithium-niobate waveguide circuits