Adaptive local measurement strategies verify the three-qubit GHZ-W entangled subspace with sample complexity about 2.248 ε^{-1} ln δ^{-1}.
The above constructive proof reveals that, if V has at least two distinct product states, then the number of distinct product states in V equals that in V ⊥, and is either 2 or +∞
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GHZ-W Genuinely Entangled Subspace Verification with Adaptive Local Measurements
Adaptive local measurement strategies verify the three-qubit GHZ-W entangled subspace with sample complexity about 2.248 ε^{-1} ln δ^{-1}.