Identifying the Sign of Coherent Over-Rotations with Logarithmically Many Pauli Settings
A new arXiv preprint addresses calibration of quantum processors by targeting coherent over-rotation errors. It shows how to identify the sign of such errors, not just their magnitude, for commuting single- and two-qubit transverse over-rotations with known support on the computational basis, using a number of Pauli measurement settings that scales logarithmically.
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What this could mean
- 0–2 yearsPlausible
The technique could be folded into existing gate-calibration protocols on near-term superconducting or trapped-ion devices, allowing calibration routines to pin down the sign of coherent errors without large measurement overhead.
Standard Pauli measurements are already routine in device characterization; if the logarithmic setting count holds experimentally, calibration software could add sign estimation as a low-cost step, improving gate characterization and enabling better error-aware compilation on current hardware.
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