Unhackable quantum comms for all

摘要

THERE'S a new way to make sure quantum networks are secure. Theoretically, messages sent via quantum networks are protected by the laws of quantum mechanics. This is because any attempt to intercept information sent between two parties will disturb its fragile quantum state, revealing the eavesdropper. One way to check a quantum line is secure involves solving an equation called a Bell inequality - if the result exceeds a certain number, there is a limit to how much information a spy can extract without being detected.