Cross-platform certification of the qubit space with a minimal number of parameters

Abstract

We demonstrate a determinant dimension witness of a qubit space. Our test has a minimal number of independent parameters. We achieve it by mapping the Bloch sphere $\pi /2$-rotation axis angle on the non-planar so-called Viviani curve. We ran our test on different platforms: IBM Quantum, IQM Resonance, and IonQ. Our investigations show that numerous qubits, especially from the newest IBM Heron family devices, fail the test by more than ten standard deviations. The nature of those deviations has no simple explanation as the test is robust against common imperfections.

13 pages, 10 figures, 4 tables, added results from IBM Quantum, IQM, IonQ

References in corpus (12)

• Charge insensitive qubit design derived from the Cooper pair box
• Quantum Error Mitigation
• Manipulation and Detection of a Trapped Yb+ Ion Hyperfine Qubit
• Device-independent tests of classical and quantum dimensions
• Fundamental limits of quantum error mitigation
• Dimension witnesses and quantum state discrimination
• Device-independent certification of Hilbert space dimension using a family of Bell expressions
• Optimal classical and quantum real and complex dimension witness
• Nonlinear Signal Distortion Corrections Through Quantum Sensing
• Testing accuracy of qubit rotations on a public quantum computer
• Precise certification of a qubit space
• Quantum dimension witness with a single repeated operation