Analytical self-testing criterion proven for equal-coefficient symmetric three-qubit state; general family shown numerically self-testable via swap method and SDP.
This state can be normalized into the form of |junk⟩ABC ⊗ |ψ ⟩A′B′C ′, here |junk⟩ = √ 5P 0 AP 0 BP 0 C |ψ ⟩
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Self-testing of symmetric three-qubit states
Analytical self-testing criterion proven for equal-coefficient symmetric three-qubit state; general family shown numerically self-testable via swap method and SDP.