Cited by 159Quantum Information and CryptographyQuantum Computing Algorithms and ArchitectureSuperconducting and THz Device Technology

Tunable Coupling Architecture for Fixed-Frequency Transmon Superconducting Qubits

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Stehlik, J., Zajac, D. M., Underwood, D. L., Phung, T., Blair, J., Carnevale, S., Klaus, D., Keefe, G. A. +4 more·2021·Physical Review Letters

Abstract

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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  • With the tuneable coupler in IBM Quantum Egret and now being developed for the IBM Quantum Heron, the energy collision problem no longer exists as qubit frequencies can be designed to be farther apart.

    “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]

    The passage on energy-level collisions (indexed under Abstract; page unavailable) says larger separation between qubit frequencies can avoid the resulting gate-operation complications. It does not say energy collisions no longer exist, or identify the coupler as used in IBM Quantum Egret or being developed for Heron. (LLM, conf=0.86)

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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)
Venue
Physical Review Letters
Published
2021-08-20
Volume
127
Issue
8
Pages
080505-080505
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
OpenAlex
W3196141026
Cited by
159
References
29
Citations by year
2026: 21 · 2025: 38 · 2024: 45 · 2023: 27 · 2022: 20 · 2021: 7 · 2017: 1
FWCI
8.71
Type
journal article
Language
en
Open access
Locations
  • Physical Review Letters (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Superconducting and THz Device Technology
Keywords
transmon qubits, adiabaticity, gate speed, quantum error correction

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