Increasing the power of the verifier in Quantum Zero Knowledge

Andre Chailloux & Iordanis Kerenidis
In quantum zero knowledge, the assumption was made that the verifier is only using unitary operations. Under this assumption, many nice properties have been shown about quantum zero knowledge, including the fact that Honest-Verifier Quantum Statistical Zero Knowledge ($HVQSZK$) is equal to Cheating-Verifier Quantum Statistical Zero Knowledge ($QSZK$) (see ~\cite{Wat02,Wat06}). In this paper, we study what happens when we allow an honest verifier to flip some coins in addition to using unitary operations. Flipping a...
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