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Secure Multiparty Delegated Quantum Computation
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==Outline== The Protocol consists of 2 phases: Preparation phase and Computation phase. ===Preparation phase=== * '''Input qubits:''' For the input qubit states, each client one-time pads their qubit and uses [[Quantum Secret Sharing|secret sharing]] schemes to share the secret values with other clients. The honest behaviour for every client is enforced via the given protocol. The server then one-time pads them and measures the one-time padded qubits and announces the measurement values. * '''Non-output and non-input qubits:''' The clients send the qubits in random phases allowed in MBQC. The server then one-time pads them and announces the measurement values. * '''Output qubits:''' The server prepares them in the <math>|+\rangle</math> state. * '''Graph state:''' The server entangles the qubits to a brickwork state. ===Computation phase=== * '''Non-output qubits:''' All clients choose a random bit based on which they compute the measurement angle of the qubits. They send this angle to the server who then returns the result based on the measurement. * '''Output qubits:''' The server sends the encrypted qubits to the corresponding clients. The clients then jointly compute the Pauli corrections and apply them to get the actual output.
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