High-Rate Cross-Channel Entanglement Swapping Between Independent On-Chip Sources

The emerging integrated quantum photonics is pushing forward the establishment of quantum networks. To interconnect individual chip-based quantum sources, high-performance entanglement swapping is indispensable. Here, using low-loss silicon chips with waveguide structure and frequency-offset pumps, high-rate cross-channel entanglement swapping is demonstrated. A record-high swapping rate of 207 counts per hour is obtained, and the measured swapping visibilities between each of two pairs of channels exceed 90%. The proposed cross-channel architecture allows dynamic channel switching by adjusting pump wavelengths, enabling flexible user pairing in quantum networks. This work makes a concrete benchmark for chip-based entanglement swapping and provides a viable solution for real-world quantum communication.