George Pennington et al., Figure 2, npj Quantum Information · The article is published under CC BY 4.0. Its rights statement permits commercial use, sharing, adaptation, distribution and reproduction with attribution, a license link and disclosure of changes. Figure 2 has no separate third-party credit line and is included under the article license. The exact figure is used without alteration except proportional display scaling. No IBM, STFC, NPL, author or publisher endorsement is implied.
ANALYSIS Quantum
IBM Hardware Measured 20-Site String Order in a 100-Qubit Spin Chain
Shallow compiled circuits exposed three signatures of topological order, but their 97.9 to 99.0 percent overlaps were classical calculations, not hardware-state fidelities.