Locally gentle measurement of qubits requires 1/(epsilon^2 alpha^2) copies for tomography and certification, and the quantum Label Switch achieves this rate.
[BDKS20] Cristina Butucea, Amandine Dubois, Martin Kroll, and Adrien Saumard
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Sample-optimal learning of quantum states using gentle measurements
Locally gentle measurement of qubits requires 1/(epsilon^2 alpha^2) copies for tomography and certification, and the quantum Label Switch achieves this rate.