RPE-based closed-loop calibration reduces coherent errors in a superconducting CZ gate, cutting diamond distance to the ideal gate by about half.
The CZ gate has a target unitary operation UCZ = I ⊗ |0⟩ ⟨0| + Z ⊗ |1⟩ ⟨1|, or written in an equivalent exponential notation UCZ = exp − i 2 − π 2 II + π 2 ZI+ π 2 IZ− π 2 ZZ
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Heisenberg-limited calibration of entangling gates with robust phase estimation
RPE-based closed-loop calibration reduces coherent errors in a superconducting CZ gate, cutting diamond distance to the ideal gate by about half.