This paper gives the first formal treatment of a quantum analogue of multi-prover interactive proof systems. It is proved that the class of languages having quantum multi-prover interactive proof systems is necessarily contained in NEXP, under the assumption that provers are allowed to share at most polynomially many prior-entangled qubits. This implies that, in particular, without any prior entanglement among provers, the class of languages having quantum multi-prover interactive proof systems is equal to NEXP. Related to these, it is shown that, if a prover does not have his private qubits, the class of languages having quantum single-prover interactive proof systems is also equal to NEXP.
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