  We show that the class QAM does not change even if the verifier's ability is
restricted to only single-qubit measurements. To show the result, we use the
idea of the measurement-based quantum computing: the verifier, who can do only
single-qubit measurements, can test the graph state sent from the prover and
use it for his measurement-based quantum computing. We also introduce a new
QMA-complete problem related to the stabilizer test.
