A three-stage adaptive method using locally informationally complete Fisher-symmetric measurements estimates pure states with O(d/N) error scaling and infidelity close to the Gill-Massar lower bound using 7d-3 outcomes.
Finally, we can approximate the average infidelity at each stage as ¯I1(|Ψ⟩) ≈ 1.32(d − 1)1.84 N , (F4) ¯I2(|Ψ⟩) ≈ 1.45(d − 1) N
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Near-optimal pure state estimation with adaptive Fisher-symmetric measurements
A three-stage adaptive method using locally informationally complete Fisher-symmetric measurements estimates pure states with O(d/N) error scaling and infidelity close to the Gill-Massar lower bound using 7d-3 outcomes.