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Tunable Coupling Architecture for Fixed-Frequency Transmon Superconducting Qubits
Open accessAbstract
Implementation of high-fidelity 2-qubit operations is a key ingredient for scalable quantum error correction. In superconducting qubit architectures, tunable buses have been explored as a means to higher-fidelity gates. However, these buses introduce new pathways for leakage. Here we present a modified tunable bus architecture appropriate for fixed-frequency qubits in which the adiabaticity restrictions on gate speed are reduced. We characterize this coupler on a range of 2-qubit devices, achieving a maximum gate fidelity of 99.85%. We further show the calibration is stable over one day.
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“However, with the tuneable coupler55,56 in IBM Quantum Egret and now being developed for the IBM Quantum Heron, this problem no longer exists as qubit frequencies can be designed to be farther apart.”
From High-threshold and low-overhead fault-tolerant quantum memory (2024) · cites this paper as [56]
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Tunable Coupling Scheme for Implementing High-Fidelity Two-Qubit Gates
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“The direct capacitor between Q1 and Q2 adds a positive coupling term gQ1,Q2; thus, the total effective coupling then becomes Jtot ≈ Jbus +gQ1,Q2 [12].”
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Metadata
- Authors
- Stehlik, J., Zajac, D. M., Underwood, D. L., Phung, T., Blair, J., Carnevale, S., Klaus, D., Keefe, G. A., Carniol, A., Kumph, M., Steffen, M., & Dial, O. E.
- Affiliations
- IBM (United States) (US)
- IBM Research - Almaden (US)
- ORCID
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2021-08-20
- Volume
- 127
- Issue
- 8
- Pages
- 080505-080505
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W3196141026
- Semantic Scholar
- ff1016f75b3d25e035add6d5fb668b505a37ac64
- Cited by
- 159
- References
- 29
- Citations by year
- 2026: 21 · 2025: 38 · 2024: 45 · 2023: 27 · 2022: 20 · 2021: 7
- FWCI
- 8.71
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Physical Review Letters (publishedVersion, cc-by)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Information and Cryptography
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Superconducting and THz Device Technology
- Keywords
- transmon qubits, adiabaticity, gate speed, quantum error correction
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