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Cited by 177Quantum Information and CryptographySuperconducting and THz Device TechnologyPhysics of Superconductivity and Magnetism

Experimental demonstration of a robust and scalable flux qubit

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Harris, R., Johansson, J., Berkley, A. J., Johnson, M. W., Lanting, T., Han, Siyuan, Bunyk, P., Ladizinsky, E. +11 more·2010·Physical Review B
DOI 10.1103/physrevb.81.134510
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Abstract

A rf--superconducting quantum interference device (SQUID) flux qubit that is robust against fabrication variations in Josephson-junction critical currents and device inductance has been implemented. Measurements of the persistent current and of the tunneling energy between the two lowest-lying states, both in the coherent and incoherent regimes, are presented. These experimental results are shown to be in agreement with predictions of a quantum-mechanical Hamiltonian whose parameters were independently calibrated, thus justifying the identification of this device as a flux qubit. In addition, measurements of the flux and critical current noise spectral densities are presented that indicate that these devices with Nb wiring are comparable to the best Al wiring rf SQUIDs reported in the literature thus far, with a $1/f$ flux noise spectral density at 1 Hz of ${1.3}_{\ensuremath{-}0.5}^{+0.7}\text{ }\ensuremath{\mu}{\ensuremath{\Phi}}_{0}/\sqrt{\text{Hz}}$. An explicit formula for converting the observed flux noise spectral density into a free-induction-decay time for a flux qubit biased to its optimal point and operated in the energy eigenbasis is presented.

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  • QPUs use rf-SQUID flux qubits to approximately realize ideal spin-1/2 particles in a TFIM.

    “The QPUs use radio-frequency superconducting quantum interference device (rf-SQUID) flux qubits to approximately realize ideal spin-1/2 particles in a TFIM 68 .”

    From Beyond-classical computation in quantum simulation (2025) · cites this paper as [68]

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Cited by

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Authors
Harris, R., Johansson, J., Berkley, A. J., Johnson, M. W., Lanting, T., Han, S., Bunyk, P., Ladizinsky, E., Oh, T., Perminov, I., Tolkacheva, E., Uchaikin, S., Chapple, E. M., Enderud, C., Rich, C., Thom, M., Wang, J., Wilson, B., & Rose, G.
Affiliations
  • D-Wave Systems (Canada) (CA)
  • University of Kansas (US)
ORCID
Venue
Physical Review B
Publisher
American Physical Society (APS)
Published
2010-04-07
Volume
81
Issue
13
ISSN
  • 1098-0121 (ISSN-L)
  • 1550-235X
DOI
10.1103/physrevb.81.134510
OpenAlex
W2108357628
Cited by
177
References
3
Citations by year
2026: 3 · 2025: 6 · 2024: 19 · 2023: 8 · 2022: 11 · 2021: 23 · 2020: 17 · 2019: 13 · 2018: 9 · 2017: 10 · 2016: 10 · 2015: 6 · 2014: 14 · 2013: 9 · 2012: 5
FWCI
8.90
Type
journal article
Language
en
Open access
Licence
link.aps.org/licenses/aps-default-license (vor)
Locations
  • Physical Review B (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • KU ScholarWorks (University of Kansas) (submittedVersion, other-oa)
  • arXiv (Cornell University)
Funders
  • National Science Foundation (0325551)
  • Division of Materials Research
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Superconducting and THz Device Technology
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
Keywords
flux qubits, rf SQUID, Josephson junctions, critical current, persistent currents, tunneling energy, noise spectral density

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