Quantum encryption design overcomes Shannon's theorem to achieve perfect secrecy with reusable keys

Shannon's perfect-secrecy theorem states that a perfect encryption system that yields zero information to the adversary must be a one-time pad (OTP) with the keys randomly generated and never reused. However, recently discovered exotic properties of quantum entanglement have motivated us to reconsider Shannon's theorem in the quantum regime. In this work we design a quantum encryption method that overcomes Shannon's theorem to achieve perfect secrecy with reusable keys. The mechanism used is fundamentally quantum, demonstrating subtle but critical differences in how information is processed in quantum versus classical systems.