Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.04702 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915184470130688 |
|---|---|
| author | Chen, Larry Lee, Kan-Heng Liu, Chuan-Hong Marinelli, Brian Naik, Ravi K. Kang, Ziqi Goss, Noah Kim, Hyunseong Santiago, David I. Siddiqi, Irfan |
| author_facet | Chen, Larry Lee, Kan-Heng Liu, Chuan-Hong Marinelli, Brian Naik, Ravi K. Kang, Ziqi Goss, Noah Kim, Hyunseong Santiago, David I. Siddiqi, Irfan |
| contents | State-of-the-art superconducting quantum processors containing tens to hundreds of qubits have demonstrated the building blocks for realizing fault-tolerant quantum computation. Nonetheless, a fundamental barrier to scaling further is the prevalence of fluctuating quantum two-level system (TLS) defects that can couple resonantly to qubits, causing excess decoherence and enhanced gate errors. Here we introduce a scalable architecture for site-specific and in-situ manipulation of TLS frequencies out of the spectral vicinity of our qubits. Our method is resource efficient, combining TLS frequency tuning and universal single qubit control into a single on-chip control line per qubit. We independently control each qubit's dissipative environment to dynamically improve both qubit coherence times and single qubit gate fidelities -- with a constant time overhead that does not scale with the device size. Over a period of 40 hours across 6 qubits, we demonstrate a $36\%$ improvement in average single qubit error rates and a $17\%$ improvement in average energy relaxation times. Critically, we realize a 4-fold suppression in the occurrence of TLS-induced performance outliers, and a complete reduction of simultaneous outlier events. These results mark a significant step toward overcoming the challenges that TLS defects pose to scaling superconducting quantum processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_04702 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Scalable and Site-Specific Frequency Tuning of Two-Level System Defects in Superconducting Qubit Arrays Chen, Larry Lee, Kan-Heng Liu, Chuan-Hong Marinelli, Brian Naik, Ravi K. Kang, Ziqi Goss, Noah Kim, Hyunseong Santiago, David I. Siddiqi, Irfan Quantum Physics State-of-the-art superconducting quantum processors containing tens to hundreds of qubits have demonstrated the building blocks for realizing fault-tolerant quantum computation. Nonetheless, a fundamental barrier to scaling further is the prevalence of fluctuating quantum two-level system (TLS) defects that can couple resonantly to qubits, causing excess decoherence and enhanced gate errors. Here we introduce a scalable architecture for site-specific and in-situ manipulation of TLS frequencies out of the spectral vicinity of our qubits. Our method is resource efficient, combining TLS frequency tuning and universal single qubit control into a single on-chip control line per qubit. We independently control each qubit's dissipative environment to dynamically improve both qubit coherence times and single qubit gate fidelities -- with a constant time overhead that does not scale with the device size. Over a period of 40 hours across 6 qubits, we demonstrate a $36\%$ improvement in average single qubit error rates and a $17\%$ improvement in average energy relaxation times. Critically, we realize a 4-fold suppression in the occurrence of TLS-induced performance outliers, and a complete reduction of simultaneous outlier events. These results mark a significant step toward overcoming the challenges that TLS defects pose to scaling superconducting quantum processors. |
| title | Scalable and Site-Specific Frequency Tuning of Two-Level System Defects in Superconducting Qubit Arrays |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.04702 |