Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2412.11611 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866911470852243456 |
|---|---|
| author | Feldstein-Bofill, David Sun, Zhenhai Wied, Casper Singh, Shikhar Isakov, Brian D. Krøjer, Svend Hastrup, Jacob Gyenis, András Kjaergaard, Morten |
| author_facet | Feldstein-Bofill, David Sun, Zhenhai Wied, Casper Singh, Shikhar Isakov, Brian D. Krøjer, Svend Hastrup, Jacob Gyenis, András Kjaergaard, Morten |
| contents | The development of quantum circuits based on hybrid superconductor-semiconductor Josephson junctions holds promise for exploring their mesoscopic physics and for building novel superconducting devices. The gate-tunable superconducting transmon qubit (gatemon) is the paradigmatic example of such a superconducting circuit. However, gatemons typically suffer from unstable and hysteretic qubit frequencies with respect to the applied gate voltage and reduced coherence times. Here we develop methods for characterizing these challenges in gatemons and deploy these methods to compare the impact of shunt capacitor designs on gatemon performance. Our results indicate a strong frequency- and design-dependent behavior of the qubit stability, hysteresis, and dephasing times. Moreover, we achieve highly reliable tuning of the qubit frequency with 1 MHz precision over a range of several GHz, along with improved stability in grounded gatemons compared to gatemons with a floating capacitor design. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_11611 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gatemon Qubit Revisited for Improved Reliability and Stability Feldstein-Bofill, David Sun, Zhenhai Wied, Casper Singh, Shikhar Isakov, Brian D. Krøjer, Svend Hastrup, Jacob Gyenis, András Kjaergaard, Morten Mesoscale and Nanoscale Physics Quantum Physics The development of quantum circuits based on hybrid superconductor-semiconductor Josephson junctions holds promise for exploring their mesoscopic physics and for building novel superconducting devices. The gate-tunable superconducting transmon qubit (gatemon) is the paradigmatic example of such a superconducting circuit. However, gatemons typically suffer from unstable and hysteretic qubit frequencies with respect to the applied gate voltage and reduced coherence times. Here we develop methods for characterizing these challenges in gatemons and deploy these methods to compare the impact of shunt capacitor designs on gatemon performance. Our results indicate a strong frequency- and design-dependent behavior of the qubit stability, hysteresis, and dephasing times. Moreover, we achieve highly reliable tuning of the qubit frequency with 1 MHz precision over a range of several GHz, along with improved stability in grounded gatemons compared to gatemons with a floating capacitor design. |
| title | Gatemon Qubit Revisited for Improved Reliability and Stability |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2412.11611 |