Entanglement in interactive proof systems with binary answers

  • Authors:
  • Stephanie Wehner

  • Affiliations:
  • CWI, Amsterdam, The Netherlands

  • Venue:
  • STACS'06 Proceedings of the 23rd Annual conference on Theoretical Aspects of Computer Science
  • Year:
  • 2006

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Abstract

If two classical provers share an entangled state, the resulting interactive proof system is significantly weakened [6]. We show that for the case where the verifier computes the XOR of two binary answers, the resulting proof system is in fact no more powerful than a system based on a single quantum prover: $\rm \bigoplus MIP^*[2] \subseteq QIP(2)$. This also implies that $\rm \bigoplus MIP^*[2] \subseteq EXP$ which was previously shown using a different method [7]. This contrasts with an interactive proof system where the two provers do not share entanglement. In that case, $\rm \bigoplus MIP[2] = NEXP$ for certain soundness and completeness parameters[6].