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Problem Addressed

The highly connected and mobile nature of modern society makes security in encrypted communication a top priority. Quantum illumination (QI) is a common encryption technique that uses multimode entangled light beams to secure communication against a passive eavesdropper, who is allowed to collect all light that is lost in propagation between the two communicating parties. QI faces issues that keep it from being applicable, namely: (1) it is not secure against an active attack in which an eavesdropper injects their own light into the sender to learn about the message; (2) its protocol has limitations on its secure data rate and on the distance between the sender and receiver. The Inventors have developed a new approach that overcomes these barriers and provides for much higher secure communication rates with longer distances.