Real-time adaptive tracking of fluctuating relaxation rates in superconducting qubits
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912902910312448 |
|---|---|
| author | Berritta, Fabrizio Benestad, Jacob Krzywda, Jan A. Krause, Oswin Marciniak, Malthe A. Krøjer, Svend Warren, Christopher W. Hogedal, Emil Nylander, Andreas Ahmad, Irshad Osman, Amr Biznárová, Janka Rommel, Marcus Roudsari, Anita Fadavi Bylander, Jonas Tancredi, Giovanna Danon, Jeroen Hastrup, Jacob Kuemmeth, Ferdinand Kjaergaard, Morten |
| author_facet | Berritta, Fabrizio Benestad, Jacob Krzywda, Jan A. Krause, Oswin Marciniak, Malthe A. Krøjer, Svend Warren, Christopher W. Hogedal, Emil Nylander, Andreas Ahmad, Irshad Osman, Amr Biznárová, Janka Rommel, Marcus Roudsari, Anita Fadavi Bylander, Jonas Tancredi, Giovanna Danon, Jeroen Hastrup, Jacob Kuemmeth, Ferdinand Kjaergaard, Morten |
| contents | The fidelity of operations on a solid-state quantum processor is fundamentally bounded by environmental decoherence. Characterizing environmental fluctuations is challenging because the acquisition time of nonadaptive experimental protocols limits temporal precision and can average out rapid features of the underlying dynamics. Here, we overcome this temporal-resolution limit by two orders of magnitude using a field-programmable gate-array (FPGA) powered classical controller that adaptively and continuously tracks the relaxation-time fluctuations of two fixed-frequency superconducting transmon qubits, which exhibit average relaxation times of approximately 0.17 ms and occasionally exceed 0.5 ms. We report events in which the relaxation time switches by nearly an order of magnitude over timescales of just tens of milliseconds, rather than minutes or hours as previously reported. Our real-time Bayesian estimation protocol estimates relaxation times within a few milliseconds, close to the decoherence timescale itself. Our statistical analysis further suggests that some of these fast fluctuations arise from two-level systems switching at rates up to 10 Hz, four orders of magnitude faster than earlier reports. These results redefine the timescales relevant for calibration in superconducting quantum processing units, establish a reference for rapid relaxation-rate characterization in device screening, and improve our understanding of fast relaxation dynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_09576 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Real-time adaptive tracking of fluctuating relaxation rates in superconducting qubits Berritta, Fabrizio Benestad, Jacob Krzywda, Jan A. Krause, Oswin Marciniak, Malthe A. Krøjer, Svend Warren, Christopher W. Hogedal, Emil Nylander, Andreas Ahmad, Irshad Osman, Amr Biznárová, Janka Rommel, Marcus Roudsari, Anita Fadavi Bylander, Jonas Tancredi, Giovanna Danon, Jeroen Hastrup, Jacob Kuemmeth, Ferdinand Kjaergaard, Morten Quantum Physics Mesoscale and Nanoscale Physics The fidelity of operations on a solid-state quantum processor is fundamentally bounded by environmental decoherence. Characterizing environmental fluctuations is challenging because the acquisition time of nonadaptive experimental protocols limits temporal precision and can average out rapid features of the underlying dynamics. Here, we overcome this temporal-resolution limit by two orders of magnitude using a field-programmable gate-array (FPGA) powered classical controller that adaptively and continuously tracks the relaxation-time fluctuations of two fixed-frequency superconducting transmon qubits, which exhibit average relaxation times of approximately 0.17 ms and occasionally exceed 0.5 ms. We report events in which the relaxation time switches by nearly an order of magnitude over timescales of just tens of milliseconds, rather than minutes or hours as previously reported. Our real-time Bayesian estimation protocol estimates relaxation times within a few milliseconds, close to the decoherence timescale itself. Our statistical analysis further suggests that some of these fast fluctuations arise from two-level systems switching at rates up to 10 Hz, four orders of magnitude faster than earlier reports. These results redefine the timescales relevant for calibration in superconducting quantum processing units, establish a reference for rapid relaxation-rate characterization in device screening, and improve our understanding of fast relaxation dynamics. |
| title | Real-time adaptive tracking of fluctuating relaxation rates in superconducting qubits |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2506.09576 |