Quantum Security: How Eavesdropping Leaves a Detectable Mark

Researchers at the University of Hong Kong and Jagiellonian University have demonstrated a new security method for quantum-encrypted communications. When someone tries to intercept the system, they must measure the quantum particles—an act that destroys the entanglement linking sender and receiver, leaving a telltale signature of the intrusion. The work reflects broader efforts to fortify quantum defenses as quantum computing grows more capable.