Improving the Rate-Loss Scaling in Polarization Entanglement Distribution using Single-Click Entanglement Swapping
The authors improved polarization entanglement distribution by combining single-click entanglement swapping with hybrid entanglement between polarization and photon-number qubits. This technique overcomes the conventional O(ηC) rate-loss scaling limit, achieving a square root improvement in efficiency. The method yields high-fidelity entangled states and demonstrates a significant advantage for large-scale quantum networks.