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 $P$ can prove they know some secret without
transmitting that directly to a verifier $V$ by means of a quantum channel –
allowing for a ZKP wherein an eavesdropper or manipulation can be detected with
a `fail safe’ design. 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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