Experimental Quantum Communication Overcomes the Rate-Loss Limit without Global Phase Tracking

Experimental Quantum Communication Overcomes the Rate-Loss Limit without Global Phase Tracking Secure key rate (SKR) of point-point quantum key distribution (QKD) is fundamentally bounded by the rate-loss limit. Recent breakthrough of twin-field (TF) QKD can overcome this limit and enables long distance quantum communication, but its implementation necessitates complex global phase tracking and requires strong phase references that not only add to noise but also reduce the duty cycle for quantu...