Calibration of Drive Non-Linearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866912517481037824 |
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| author | Lazăr, Stefania Ficheux, Quentin Herrmann, Johannes Remm, Ants Lacroix, Nathan Hellings, Christoph Swiadek, Francois Zanuz, Dante Colao Norris, Graham J. Panah, Mohsen Bahrami Flasby, Alexander Kerschbaum, Michael Besse, Jean-Claude Eichler, Christopher Wallraff, Andreas |
| author_facet | Lazăr, Stefania Ficheux, Quentin Herrmann, Johannes Remm, Ants Lacroix, Nathan Hellings, Christoph Swiadek, Francois Zanuz, Dante Colao Norris, Graham J. Panah, Mohsen Bahrami Flasby, Alexander Kerschbaum, Michael Besse, Jean-Claude Eichler, Christopher Wallraff, Andreas |
| contents | The ability to execute high-fidelity operations is crucial to scaling up quantum devices to large numbers of qubits. However, signal distortions originating from non-linear components in the control lines can limit the performance of single-qubit gates. In this work, we use a measurement based on error amplification to characterize and correct the small single-qubit rotation errors originating from the non-linear scaling of the qubit drive rate with the amplitude of the programmed pulse. With our hardware, and for a 15-ns pulse, the rotation angles deviate by up to several degrees from a linear model. Using purity benchmarking, we find that control errors reach $2\times 10^{-4}$, which accounts for half of the total gate error. Using cross-entropy benchmarking, we demonstrate arbitrary-angle single-qubit gates with coherence-limited errors of $2\times 10^{-4}$ and leakage below $6\times 10^{-5}$. While the exact magnitude of these errors is specific to our setup, the presented method is applicable to any source of non-linearity. Our work shows that the non-linearity of qubit drive line components imposes a limit on the fidelity of single-qubit gates, independent of improvements in coherence times, circuit design, or leakage mitigation when not corrected for. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2212_01077 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Calibration of Drive Non-Linearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification Lazăr, Stefania Ficheux, Quentin Herrmann, Johannes Remm, Ants Lacroix, Nathan Hellings, Christoph Swiadek, Francois Zanuz, Dante Colao Norris, Graham J. Panah, Mohsen Bahrami Flasby, Alexander Kerschbaum, Michael Besse, Jean-Claude Eichler, Christopher Wallraff, Andreas Quantum Physics The ability to execute high-fidelity operations is crucial to scaling up quantum devices to large numbers of qubits. However, signal distortions originating from non-linear components in the control lines can limit the performance of single-qubit gates. In this work, we use a measurement based on error amplification to characterize and correct the small single-qubit rotation errors originating from the non-linear scaling of the qubit drive rate with the amplitude of the programmed pulse. With our hardware, and for a 15-ns pulse, the rotation angles deviate by up to several degrees from a linear model. Using purity benchmarking, we find that control errors reach $2\times 10^{-4}$, which accounts for half of the total gate error. Using cross-entropy benchmarking, we demonstrate arbitrary-angle single-qubit gates with coherence-limited errors of $2\times 10^{-4}$ and leakage below $6\times 10^{-5}$. While the exact magnitude of these errors is specific to our setup, the presented method is applicable to any source of non-linearity. Our work shows that the non-linearity of qubit drive line components imposes a limit on the fidelity of single-qubit gates, independent of improvements in coherence times, circuit design, or leakage mitigation when not corrected for. |
| title | Calibration of Drive Non-Linearity for Arbitrary-Angle Single-Qubit Gates Using Error Amplification |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2212.01077 |