  Quantum devices for generating entangled states have been extensively studied
and widely used. As so, it becomes necessary to verify that these devices truly
work reliably and efficiently as they are specified. Here, we experimentally
realize the recently proposed two-qubit entangled state verification strategies
using both local measurements (nonadaptive) and active feed-forward operations
(adaptive) with a photonic platform. About 3283/536 number of copies ($N$) are
required to achieve a 99% confidence to verify the target quantum state for
nonadaptive/adaptive strategies. These optimal strategies provide the
Heisenberg scaling of the infidelity $\epsilon$ as a function of $N$
($\epsilon$ $\sim$ $N^r$) with the parameter $r=-1$, exceeding the standard
quantum limit with $r=-0.5$. We experimentally obtain the scaling parameter of
$r=-0.88\pm$0.03 and $-0.78\pm$0.07 for nonadaptive and adaptive strategies,
respectively. Our experimental work could serve as a standardized procedure for
the verification of quantum states.
