Fig. 5: System-qubit state fidelities in the response function calculation of NaH. | npj Quantum Information

Fig. 5: System-qubit state fidelities in the response function calculation of NaH.

From: Quantum computation of frequency-domain molecular response properties using a three-qubit iToffoli gate

Fig. 5

A, B Fidelities between the raw experimental and exact system-qubit density matrices without (A) and with RC (B). The diagonal elements correspond to system-qubit density matrices in the diagonal circuits after taking the ancilla state a0 = 1, and the off-diagonal elements correspond to the system-qubit density matrices in the off-diagonal circuits after taking the ancilla states either as (a0, a1) = (1, 0) (upper diagonal) or as (a0, a1) = (1, 1) (lower diagonal). C, D Fidelities between the purified experimental and exact system-qubit density matrices without (C) and with RC (D). The layout of the tiles is the same as in panels (A, B). Without RC, purification raises the average off-diagonal fidelity from 45.2% to 67.4%, but with both RC and purification, the average off-diagonal fidelity increases to 96.0%.

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