Analysis and mitigation of residual exchange coupling in linear spin-qubit arrays

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2024
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Mills, Adam R.
Petta, Jason R.
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Physical Review Research. American Physical Society (APS). 2024, 6(1), 013153. eISSN 2643-1564. Available under: doi: 10.1103/physrevresearch.6.013153
Zusammenfassung

In recent advancements of quantum computing utilizing spin qubits, it has been demonstrated that this platform possesses the potential for implementing two-qubit gates with fidelities exceeding 99.5%. However, as with other qubit platforms, it is not feasible to completely turn qubit couplings off. This study aims to investigate the impact of coherent error matrices in gate set tomography by employing a double quantum dot. We evaluate the infidelity caused by residual exchange between spins and compare various mitigation approaches, including the use of adjusted timing through simple drives, considering different parameter settings in the presence of charge noise. Furthermore, we extend our analysis to larger arrays of exchange-coupled spin qubits to provide an estimation of the expected fidelity. In particular, we demonstrate the influence of residual exchange on a single-qubit Y gate and the native two-qubit SWAP gate in a linear chain. Our findings emphasize the significance of accounting for residual exchange when scaling up spin-qubit devices and highlight the tradeoff between the effects of charge noise and residual exchange in mitigation techniques.

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ISO 690HEINZ, Irina, Adam R. MILLS, Jason R. PETTA, Guido BURKARD, 2024. Analysis and mitigation of residual exchange coupling in linear spin-qubit arrays. In: Physical Review Research. American Physical Society (APS). 2024, 6(1), 013153. eISSN 2643-1564. Available under: doi: 10.1103/physrevresearch.6.013153
BibTex
@article{Heinz2024Analy-69824,
  year={2024},
  doi={10.1103/physrevresearch.6.013153},
  title={Analysis and mitigation of residual exchange coupling in linear spin-qubit arrays},
  number={1},
  volume={6},
  journal={Physical Review Research},
  author={Heinz, Irina and Mills, Adam R. and Petta, Jason R. and Burkard, Guido},
  note={Article Number: 013153}
}
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