Dynamics of superconducting qubit relaxation times
Superconducting qubits are a leading candidate for quantum computing but display temporal fluctuations in their energy relaxation times T 1 . This introduces instabilities in multi-qubit device performance. Furthermore, autocorrelation in these time fluctuations introduces challenges for obtaining r...
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Veröffentlicht in: | npj quantum information 2022-11, Vol.8 (1), p.1-7, Article 132 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Superconducting qubits are a leading candidate for quantum computing but display temporal fluctuations in their energy relaxation times
T
1
. This introduces instabilities in multi-qubit device performance. Furthermore, autocorrelation in these time fluctuations introduces challenges for obtaining representative measures of
T
1
for process optimization and device screening. These
T
1
fluctuations are often attributed to time varying coupling of the qubit to defects, putative two level systems (TLSs). In this work, we develop a technique to probe the spectral and temporal dynamics of
T
1
in single junction transmons by repeated
T
1
measurements in the frequency vicinity of the bare qubit transition, via the AC-Stark effect. Across 10 qubits, we observe strong correlations between the mean
T
1
averaged over approximately nine months and a snapshot of an equally weighted
T
1
average over the Stark shifted frequency range. These observations are suggestive of an ergodic-like spectral diffusion of TLSs dominating
T
1
, and offer a promising path to more rapid
T
1
characterization for device screening and process optimization. |
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ISSN: | 2056-6387 2056-6387 |
DOI: | 10.1038/s41534-022-00643-y |