Grouping Pauli operators into commuting families before importance sampling reduces the copy count and variance of direct fidelity estimation, with a 32% copy reduction for 8-qubit Haar-random states.
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Sampling Groups of Pauli Operators to Enhance Direct Fidelity Estimation
Grouping Pauli operators into commuting families before importance sampling reduces the copy count and variance of direct fidelity estimation, with a 32% copy reduction for 8-qubit Haar-random states.