Two-message quantum interactive proofs are in PSPACE

Published 8 May 2009 in cs.CC and quant-ph | (0905.1300v1)

Abstract: We prove that QIP(2), the class of problems having two-message quantum interactive proof systems, is a subset of PSPACE. This relationship is obtained by means of an efficient parallel algorithm, based on the multiplicative weights update method, for approximately solving a certain class of semidefinite programs.

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