Precision frequency tuning of tunable transmon qubits using alternating-bias assisted annealing
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| Autores principales: | , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866911948786892800 |
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| author | Wang, Xiqiao Howard, Joel Sete, Eyob A. Stiehl, Greg Kopas, Cameron Poletto, Stefano Wu, Xian Field, Mark Sharac, Nicholas Eckberg, Christopher Cansizoglu, Hilal Katta, Raja Mutus, Josh Bestwick, Andrew Yadavalli, Kameshwar Pappas, David P. |
| author_facet | Wang, Xiqiao Howard, Joel Sete, Eyob A. Stiehl, Greg Kopas, Cameron Poletto, Stefano Wu, Xian Field, Mark Sharac, Nicholas Eckberg, Christopher Cansizoglu, Hilal Katta, Raja Mutus, Josh Bestwick, Andrew Yadavalli, Kameshwar Pappas, David P. |
| contents | Superconducting quantum processors are one of the leading platforms for realizing scalable fault-tolerant quantum computation (FTQC). The recent demonstration of post-fabrication tuning of Josephson junctions using alternating-bias assisted annealing (ABAA) technique and a reduction in junction loss after ABAA illuminates a promising path towards precision tuning of qubit frequency while maintaining high coherence. Here, we demonstrate precision tuning of the maximum $|0\rangle\rightarrow |1\rangle$ transition frequency ($f_{01}^{\rm max}$) of tunable transmon qubits by performing ABAA at room temperature using commercially available test equipment. We characterize the impact of junction relaxation and aging on resistance spread after tuning, and demonstrate a frequency equivalent tuning precision of 7.7 MHz ($0.17\%$) based on targeted resistance tuning on hundreds of qubits, with a resistance tuning range up to $18.5\%$. Cryogenic measurements on tuned and untuned qubits show evidence of improved coherence after ABAA with no significant impact on tunability. Despite a small global offset, we show an empirical $f_{01}^{\rm max}$ tuning precision of 18.4 MHz by tuning a set of multi-qubit processors targeting their designed Hamiltonians. We experimentally characterize high-fidelity parametric resonance iSWAP gates on two ABAA-tuned 9-qubit processors with fidelity as high as $99.51\pm 0.20\%$. On the best-performing device, we measured across the device a median fidelity of $99.22\%$ and an average fidelity of $99.13\pm 0.12 \%$. Yield modeling analysis predicts high detuning-edge-yield using ABAA beyond the 1000-qubit scale. These results demonstrate the cutting-edge capability of frequency targeting using ABAA and open up a new avenue to systematically improving Hamiltonian targeting and optimization for scaling high-performance superconducting quantum processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_06425 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Precision frequency tuning of tunable transmon qubits using alternating-bias assisted annealing Wang, Xiqiao Howard, Joel Sete, Eyob A. Stiehl, Greg Kopas, Cameron Poletto, Stefano Wu, Xian Field, Mark Sharac, Nicholas Eckberg, Christopher Cansizoglu, Hilal Katta, Raja Mutus, Josh Bestwick, Andrew Yadavalli, Kameshwar Pappas, David P. Quantum Physics Mesoscale and Nanoscale Physics Materials Science Superconductivity Applied Physics Superconducting quantum processors are one of the leading platforms for realizing scalable fault-tolerant quantum computation (FTQC). The recent demonstration of post-fabrication tuning of Josephson junctions using alternating-bias assisted annealing (ABAA) technique and a reduction in junction loss after ABAA illuminates a promising path towards precision tuning of qubit frequency while maintaining high coherence. Here, we demonstrate precision tuning of the maximum $|0\rangle\rightarrow |1\rangle$ transition frequency ($f_{01}^{\rm max}$) of tunable transmon qubits by performing ABAA at room temperature using commercially available test equipment. We characterize the impact of junction relaxation and aging on resistance spread after tuning, and demonstrate a frequency equivalent tuning precision of 7.7 MHz ($0.17\%$) based on targeted resistance tuning on hundreds of qubits, with a resistance tuning range up to $18.5\%$. Cryogenic measurements on tuned and untuned qubits show evidence of improved coherence after ABAA with no significant impact on tunability. Despite a small global offset, we show an empirical $f_{01}^{\rm max}$ tuning precision of 18.4 MHz by tuning a set of multi-qubit processors targeting their designed Hamiltonians. We experimentally characterize high-fidelity parametric resonance iSWAP gates on two ABAA-tuned 9-qubit processors with fidelity as high as $99.51\pm 0.20\%$. On the best-performing device, we measured across the device a median fidelity of $99.22\%$ and an average fidelity of $99.13\pm 0.12 \%$. Yield modeling analysis predicts high detuning-edge-yield using ABAA beyond the 1000-qubit scale. These results demonstrate the cutting-edge capability of frequency targeting using ABAA and open up a new avenue to systematically improving Hamiltonian targeting and optimization for scaling high-performance superconducting quantum processors. |
| title | Precision frequency tuning of tunable transmon qubits using alternating-bias assisted annealing |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Materials Science Superconductivity Applied Physics |
| url | https://arxiv.org/abs/2407.06425 |