Circuit-model blind quantum computation with key decoupling

Researchers have developed a key-decoupled circuit-model blind quantum computation protocol that enhances privacy protection in delegated quantum computing while reducing the operational burden on the client. By independently generating encryption and decryption keys, the protocol avoids gate-by-gate propagation of decryption information and conceals the target operation within its Pauli equivalence class. A low-overhead statistical verification strategy based on randomly sampled Pauli observables is further introduced to detect deviations by the quantum server. Proof-of-principle experiments on an IBM superconducting quantum processor, together with multi-qubit numerical simulations, demonstrate the feasibility and scalability of the approach for privacy-preserving quantum cloud computing.