Single-qubit measurements need Ω(10^N/(√N ε²)) copies for N-qubit tomography, matching the Pauli-measurement upper bound up to a √N factor.
Canonne, and Himanshu Tyagi
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Pauli Measurements Are Near-Optimal for Single-Qubit Tomography
Single-qubit measurements need Ω(10^N/(√N ε²)) copies for N-qubit tomography, matching the Pauli-measurement upper bound up to a √N factor.