USTC Demonstrates Quantum Position Verification With 75-Meter Accuracy Over 2 Kilometers of Fiber, Published in Nature Physics on September 3, 2026

Nature Physics carries the first complete demonstration of quantum position verification: two USTC verifier stations two kilometers apart confirmed a prover's location to better than 75 meters, with security resting on quantum physics and the speed of light. We read what the Hefei experiment establishes for position-based authentication in a period when roughly 1,500 flights a day meet GPS spoofing, and what still separates a laboratory fiber loop from a verification service a program office could buy.