Abstract
We report on a robust method to achieve strong coupling between a superconducting flux qubit and a high-quality quarter-wavelength coplanar waveguide resonator. We demonstrate the progression from the strong to ultrastrong coupling regime by varying the length of a shared inductive coupling element, ultimately achieving a qubit-resonator coupling strength of 655 MHz, 10% of the resonator frequency. We derive an analytical expression for the coupling strength in terms of circuit parameters and also discuss the maximum achievable coupling within this framework. We experimentally characterize flux qubits coupled to superconducting resonators using one- and two-tone spectroscopy methods, demonstrating excellent agreement with the proposed theoretical model.
| Original language | English |
|---|---|
| Article number | 044045 |
| Number of pages | 11 |
| Journal | Physical Review Applied |
| Volume | 16 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 25 Oct 2021 |
| MoE publication type | A1 Journal article-refereed |
Funding
This work is financially supported through Academy of Finland Grants No. 297240, No. 312057, and No. 303677 and from the European Union’s Horizon 2020 research and innovation programme under the European Research Council (ERC) programme (Grant No. 742559) and Marie Sklodowska-Curie actions (Grant Agreements 766025). We also thank the Russian Science Foundation (Grant No. 20-62-46026) for supporting the work. We sincerely acknowledge the provision of facilities by Micronova Nanofabrication Centre and OtaNano—Low Temperature Laboratory of Aalto University to perform this research and VTT Technical Research Center for sputtered films. Academy of Finland European Research Council Marie Sklodowska-Curie actions Russian Science Foundation
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Dive into the research topics of 'Robust Strong-Coupling Architecture in Circuit Quantum Electrodynamics'. Together they form a unique fingerprint.Projects
- 4 Finished
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QuESTech: QUantum Electronics Science and TECHnology training
Pekola, J. (Principal investigator), Peltonen, J. (Project Member) & Karimi, B. (Project Member)
01/01/2018 → 31/12/2021
Project: EU: Framework programmes funding
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SQH: Superconducting quantum heat engines and refrigerators
Pekola, J. (Principal investigator), Subero Rengel, D. (Project Member), Chiang, K.-H. (Project Member), Gubaydullin, A. (Project Member), Chang, Y.-C. (Project Member), Singh, S. (Project Member), Thomas, G. (Project Member), Upadhyay, R. (Project Member), von Scarpatetti, C. (Project Member), Serrati, E. (Project Member), Blanchet, F. (Project Member), Praks, E. (Project Member), Peltonen, J. (Project Member), Strelnikov, A. (Project Member), Chen, Z.-Y. (Project Member), Senior, J. (Project Member), Mannila, E. (Project Member), Lvov, D. (Project Member), Marín Suárez, M. (Project Member), Satrya, C. (Project Member), Lemziakov, S. (Project Member), Mäkinen, I. (Project Member), Dumas, H. (Project Member), Wang, L. (Project Member) & Karimi, B. (Project Member)
27/09/2017 → 30/09/2023
Project: EU: ERC grants
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Quantum nanoelectronics
Pekola, J. (Principal investigator), Singh, S. (Project Member), Wang, L. (Project Member), Mannila, E. (Project Member), Peltonen, J. (Project Member), Ronzani, A. (Project Member), Viisanen, K. (Project Member), Senior, J. (Project Member), Karimi, B. (Project Member) & Marín Suárez, M. (Project Member)
01/01/2017 → 31/12/2018
Project: Academy of Finland: Other research funding
Equipment
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OtaNano – Low Temperature Laboratory
Savin, A. (Manager) & Rissanen, A. (Other)
OtaNanoFacility/equipment: Facility
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