This paper presents a new method for quantum identity authentication (QIA) protocols. The logic of classical zero-knowledge proofs (ZKPs) due to Schnorr is applied in quantum circuits and algorithms. This novel approach gives an exact way with which a prover can prove they know some secret by encapsulating it in a quantum state before sending to a verifier by means of a quantum channel - allowing for a ZKP wherein an eavesdropper or manipulation can be detected with a fail-safe design. This paper presents a method with which this can be achieved. With the anticipated advent of a 'quantum internet', such protocols and ideas may soon have utility and execution in the real world.
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