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Description

Consider a $m$-round interactive protocol with soundness error $1/2$. How much extra randomness is required to decrease the soundness error to $\delta$ through parallel repetition? Previous work shows that for \emph{public-coin} interactive protocols with \emph{unconditional soundness}, $m \cdot O(\log (1/\delta))$ bits of extra randomness suffices. In this work, we initiate a more general study of the above question. \begin{itemize} \item We establish the first derandomized parallel repetition theorem for public-coin interactive protocols with \emph{computational soundness} (a.k.a. arguments). The parameters of our result essentially matches the earlier works in the information-theoretic setting. \item We show that obtaining even a sub-linear dependency on the number of rounds $m$ (i.e., $o(m) \cdot \log(1/\delta)$) in either the information-theoretic or computational settings requires proving $\P \neq \PSPACE$. \item We show that non-trivial derandomized parallel repetition for private-coin protocols is impossible in the information-theoretic setting, and requires proving $\P \neq \PSPACE$ in the computational setting. \end{itemize}

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