Preparation Changes the Cost of Calibration for Quantum Control

Abstract:Error-correction records can reveal noise yet supply the information needed for control too slowly. In a surface code under Gaussian dephasing, encoded calibration learns a correlation that reverses the preferred control mainly through rare events. A product probe exposes it more often through the same checks, reducing ideal-record sample complexity from inverse-square to inverse-linear in phase variance. Counting both calibration and execution costs, we show that this gain can repay probe overhead and enable protected tasks within budgets that exclude encoded calibration.

arXiv:2609.30910 [quant-ph]

(or arXiv:2609.30910v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.30910 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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