Scalable quantum computer with superconducting circuits in the ultrastrong coupling regime
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Abstract So far, superconducting quantum computers have certain constraints on qubit connectivity, such as nearest-neighbor couplings. To overcome this limitation, we propose a scalable architecture to simultaneously connect several pairs of distant qubits via a dispersively coupled quantum bus. The building block of the bus is composed of orthogonal coplanar waveguide resonators connected through ancillary flux qubits working in the ultrastrong coupling regime. This regime activates virtual processes that boost the effective qubit–qubit interaction, which results in quantum gates on the nanosecond timescale. The interaction is switchable and preserves the coherence of the qubits.
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For superconducting qubits, schemes to extend the connectivity exist and have been tested, but issues such as higher cross-talk have to be considered.
“For superconducting qubits, schemes to extend the connectivity exist and have been tested, but issues such as higher cross-talk have to be considered [52,71]”
From Neutral atom quantum computing hardware: performance and end-user perspective (2023) · cites this paper as [71]
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Neutral atom quantum computing hardware: performance and end-user perspective
Wintersperger, K., Dommert, F., Ehmer, T., Hoursanov, A., Klepsch, J., Mauerer, W., Reuber, G., Strohm, T., Yin, M., & Luber, S. (2023) · EPJ Quantum Technology · doi:10.1140/epjqt/s40507-023-00190-1 · Cited by 117 · see citing works
- Authors
- Stassi, R., Cirio, M., & Nori, F.
- Affiliations
- University of Messina (IT)
- Graduate School of China Academy of Engineering Physics (CN)
- University of Michigan (US)
- Corresponding author
- Stassi, Roberto
- Venue
- npj Quantum Information
- Published
- 2020-08-06
- Volume
- 6
- Issue
- 1
- ISSN
- 2056-6387 (ISSN-L)
- OpenAlex
- W3047472059
- Cited by
- 80
- References
- 8
- Citations by year
- 2026: 5 · 2025: 14 · 2024: 13 · 2023: 17 · 2022: 9 · 2021: 21 · 2020: 1
- FWCI
- 4.71
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- npj Quantum Information (publishedVersion, cc-by)
- arXiv (Cornell University) (submittedVersion)
- Funders
- Silicon Valley Community Foundation (FQXi-IAF19-06)
- Foundational Questions Institute (Grant No. FQXi-IAF19-06, FQXi‐IAF19‐06)
- Russian Foundation for Basic Research (JPJSBP120194828)
- Japan Society for the Promotion of Science (via the KAKENHI Grant No. JP20H00134 and the JSPS-RFBR Grant No. JPJSBP120194828, 20H00134, JPMJCR1676, JPJSBP120194828, CREST, FQXi-IAF19-06)
- Japan Science and Technology Agency (CREST, JP20H00134, JPJSBP120194828, JPMJCR1676)
- National Safety Academic Fund (U1930403)
- Core Research for Evolutional Science and Technology (JPMJCR1676)
- Army Research Office (W911NF- 18-1-0358, W911NF)
- 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 › Atomic and Molecular Physics, and Optics › Mechanical and Optical Resonators
- Keywords
- superconducting quantum computing, ultrastrong coupling, quantum bus, coplanar waveguide resonators, flux qubits, qubit connectivity, virtual processes, scalable quantum architecture, quantum gates, coherence preservation
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