Efficient Criteria of Quantumness for a Large System of Qubits

Shohei Watabe, Michael Zach Serikow, Shiro Kawabata, Alexandre Zagoskin

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In order to model and evaluate large-scale quantum systems, e.g., quantum computer and quantum annealer, it is necessary to quantify the “quantumness” of such systems. In this paper, we discuss the dimensionless combinations of basic parameters of large, partially quantum coherent systems, which could be used to characterize their degree of quantumness. Based on analytical and numerical calculations, we suggest one such number for a system of qubits undergoing adiabatic evolution, i.e., the accessibility index. Applying it to the case of D-Wave One superconducting quantum annealing device, we find that its operation as described falls well within the quantum domain.

Original languageEnglish
Article number773128
JournalFrontiers in Physics
Publication statusPublished - 2022 Jan 5
Externally publishedYes


  • large system of qubits
  • quantum annealing (QA)
  • quantumness
  • quantumness criterion
  • random walk

ASJC Scopus subject areas

  • Biophysics
  • Materials Science (miscellaneous)
  • Mathematical Physics
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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