A consequent tendency toward high-performance quantum information processing is to develop the fully integrated photonic chip. Here, we report the on-chip generation and manipulation of entangled photons based on reconfigurable lithium-niobate waveguide circuits. By introducing a periodically poled structure into the waveguide circuits, two individual photon-pair sources with a controllable electro-optic phase shift are produced within a Hong-Ou-Mandel interferometer, resulting in a deterministically separated identical photon pair. The state is characterized by 92.9±0.9% visibility Hong-Ou-Mandel interference. The photon flux reaches ∼1.4×10(7)  pairs nm-1 mW-1. The whole chip is designed to contain nine similar units to produce identical photon pairs spanning the telecom C and L band by the flexible engineering of nonlinearity. Our work presents a scenario for on-chip engineering of different photon sources and paves the way to fully integrated quantum technologies.

No abstract

No abstract

The general Jones matrix of the whole optical circuit in the resonator integrated optic gyro is deduced firstly, and then the propagation process of both polarization eigenstates in the gyro optic circuit is described by the matrix. The influence of refractive index difference between both polarization states, the coupling between both states in the cavity, the misalignment angle of fiber splices at the input and output port of the multifunction integrated optical device (MIOC) and the extinction ratio of MIOC, on the optical output properties of the resonator is analyzed.

No abstract