Quantum Weakly Nondeterministic Communication Complexity

Abstract In this paper we study a weak version of quantum nondeterministic communication complexity, corresponding to the most natural generalization of classical nondeterminism, in which a classical proof has to be checked with probability one by a quantum protocol. We prove that, in the framework of communication complexity, even the weak version of quantum nondeterminism is strictly stronger than classical nondeterminism. More precisely, we show the first separation, for a total function, of quantum weakly nondeterministic and classical nondeterministic communication complexity. This separation is quadratic and shows that classical proofs can be checked more efficiently by quantum protocols than by classical ones.

Authors

• François Le Gall

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