How To Track Qubits Through Space and Time (Or: Sailing in a Quantum Boat)
The research introduces 'quantum localization,' a framework for position-based cryptography that ensures successful cheating strategies must contain a specific, unclonable quantum object at a precise spacetime point $(L, t)$. It develops three primitives—Entanglement Localization, State Localization, and Functionality Localization—to verify the tracking of quantum information through space and time. This provides stronger security guarantees for position verification in quantum systems.