Optimal Calibration of Qubit Detuning and Crosstalk
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866913954905718784 |
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| author | Shnaiderov, David Dov, Matan Ben Woldiger, Yoav Hamo, Assaf Demler, Eugene Torre, Emanuele G. Dalla |
| author_facet | Shnaiderov, David Dov, Matan Ben Woldiger, Yoav Hamo, Assaf Demler, Eugene Torre, Emanuele G. Dalla |
| contents | Characterizing and calibrating physical qubits is essential for maintaining the performance of quantum processors. A key challenge in this process is the presence of crosstalk that complicates the estimation of individual qubit detunings. In this work, we derive optimal strategies for estimating detuning and crosstalk parameters by optimizing Ramsey interference experiments using Fisher information and the Cramer-Rao bound. We compare several calibration protocols, including measurements of a single quadrature at multiple times and of two quadratures at a single time, for a fixed number of total measurements. Our results predict that the latter approach yields the highest precision and robustness in both cases of isolated and coupled qubits. We validate experimentally our approach using a single NV center as well as superconducting transmons. Our approach enables accurate parameter extraction with significantly fewer measurements, resulting in up to a 50% reduction in calibration time while maintaining estimation accuracy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_10661 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optimal Calibration of Qubit Detuning and Crosstalk Shnaiderov, David Dov, Matan Ben Woldiger, Yoav Hamo, Assaf Demler, Eugene Torre, Emanuele G. Dalla Quantum Physics Other Condensed Matter Statistical Mechanics Mathematical Physics Data Analysis, Statistics and Probability Characterizing and calibrating physical qubits is essential for maintaining the performance of quantum processors. A key challenge in this process is the presence of crosstalk that complicates the estimation of individual qubit detunings. In this work, we derive optimal strategies for estimating detuning and crosstalk parameters by optimizing Ramsey interference experiments using Fisher information and the Cramer-Rao bound. We compare several calibration protocols, including measurements of a single quadrature at multiple times and of two quadratures at a single time, for a fixed number of total measurements. Our results predict that the latter approach yields the highest precision and robustness in both cases of isolated and coupled qubits. We validate experimentally our approach using a single NV center as well as superconducting transmons. Our approach enables accurate parameter extraction with significantly fewer measurements, resulting in up to a 50% reduction in calibration time while maintaining estimation accuracy. |
| title | Optimal Calibration of Qubit Detuning and Crosstalk |
| topic | Quantum Physics Other Condensed Matter Statistical Mechanics Mathematical Physics Data Analysis, Statistics and Probability |
| url | https://arxiv.org/abs/2507.10661 |