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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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Area of Science:

  • Quantum computing
  • Semiconductor manufacturing
  • Quantum information science

Background:

  • Silicon spin qubits are promising for quantum computing due to scalability.
  • Previous high-fidelity results were primarily from academic settings.
  • Reproducibility in industrial semiconductor foundries remained a key question.

Purpose of the Study:

  • To demonstrate precise qubit operation of silicon two-qubit devices manufactured in a 300-mm foundry.
  • To assess key performance metrics including fidelity and coherence times.
  • To identify factors limiting performance and suggest pathways for improvement.

Main Methods:

  • Fabrication of silicon two-qubit devices using standard semiconductor tooling.
  • Characterization of qubit performance using gate set tomography.
  • Measurement of spin lifetime and coherence times (T1, T2*, T2 Hahn).

Main Results:

  • Single- and two-qubit control fidelities exceeded 99% across all devices.
  • State preparation and measurement fidelities reached up to 99.9%.
  • Reported coherence times up to T1 = 9.5 s, T2* = 40.6 μs, and T2 Hahn = 1.9 ms.

Conclusions:

  • Foundry-scale manufacturing of silicon spin qubits is feasible with high performance.
  • Residual nuclear isotopes significantly impact operational errors.
  • Further isotopic purification offers a clear route to enhance qubit performance.