Calibrating Magnetic Flux Control in Superconducting Circuits by Compensating Distortions on Time Scales from Nanoseconds up to Tens of Microseconds
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909528055873536 |
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| author | Hellings, Christoph Lacroix, Nathan Remm, Ants Boell, Richard Herrmann, Johannes Lazăr, Stefania Krinner, Sebastian Swiadek, François Andersen, Christian Kraglund Eichler, Christopher Wallraff, Andreas |
| author_facet | Hellings, Christoph Lacroix, Nathan Remm, Ants Boell, Richard Herrmann, Johannes Lazăr, Stefania Krinner, Sebastian Swiadek, François Andersen, Christian Kraglund Eichler, Christopher Wallraff, Andreas |
| contents | Fast tuning of the transition frequency of superconducting qubits using magnetic flux is essential, for example, for realizing high-fidelity two-qubit gates with low leakage or for reducing errors in dispersive qubit readout. To apply accurately shaped flux pulses, signal distortions induced by the flux control lines need to be carefully compensated for. This requires their in situ characterization at the reference plane of the qubit. However, many existing approaches are limited in time resolution or in pulse duration. Here, we overcome these limitations and demonstrate accurate flux control with sub-permille residual frequency errors on time scales ranging from nanoseconds to tens of microseconds. We achieve this by combining two complementary methods to characterize and compensate for pulse distortions. We have deployed this approach successfully in a quantum error correction experiment calibrating 24 flux-activated two-qubit gates. Reliable calibration methods, as the ones presented here, are essential in experiments scaling up superconducting quantum processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_04610 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Calibrating Magnetic Flux Control in Superconducting Circuits by Compensating Distortions on Time Scales from Nanoseconds up to Tens of Microseconds Hellings, Christoph Lacroix, Nathan Remm, Ants Boell, Richard Herrmann, Johannes Lazăr, Stefania Krinner, Sebastian Swiadek, François Andersen, Christian Kraglund Eichler, Christopher Wallraff, Andreas Quantum Physics Fast tuning of the transition frequency of superconducting qubits using magnetic flux is essential, for example, for realizing high-fidelity two-qubit gates with low leakage or for reducing errors in dispersive qubit readout. To apply accurately shaped flux pulses, signal distortions induced by the flux control lines need to be carefully compensated for. This requires their in situ characterization at the reference plane of the qubit. However, many existing approaches are limited in time resolution or in pulse duration. Here, we overcome these limitations and demonstrate accurate flux control with sub-permille residual frequency errors on time scales ranging from nanoseconds to tens of microseconds. We achieve this by combining two complementary methods to characterize and compensate for pulse distortions. We have deployed this approach successfully in a quantum error correction experiment calibrating 24 flux-activated two-qubit gates. Reliable calibration methods, as the ones presented here, are essential in experiments scaling up superconducting quantum processors. |
| title | Calibrating Magnetic Flux Control in Superconducting Circuits by Compensating Distortions on Time Scales from Nanoseconds up to Tens of Microseconds |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.04610 |