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The hybrid quantum network, a universal form of quantum network which isaimed for quantum communication and distributed quantum computation, is thatthe quantum nodes in it are realized with different physical systems. Thisuniversal form of quantum network can combine the advantages and avoid theinherent defects of the different physical system. However, one obstaclestanding in the way is the compatible photonic quantum interface. One possiblesolution is using non-degenerate, narrow-band, entangled photon pairs as thephotonic interface. Here, for the first time, we generate nondegenratenarrow-band polarization-entangled photon pairs in cavity-enhanced spontaneousparametric down-conversion process. The bandwidths and central wavelengths ofthe signal and idler photons are 9 MHz at 935 nm and 9.5 MHz at 880 nm, whichare compatible with trapped ion system and solid-state quantum memory system.The entanglement of the photon source is certified by quantum state tomography,showing a fidelity of 89.6% between the generated quantum state with a Bellstate. Besides, a strong violation against Bell inequality with 2.36+/-0.03further confirms the entanglement property of the photon pairs. Our method issuitable for the hybrid quantum network and will take a big step in this field.

A photonic quantum interface for hybrid quantum network