Two-dimensional Si spin qubit arrays with multilevel interconnects

• URL: http://arxiv.org/abs/2502.08861v1
• Date: Thu, 13 Feb 2025 00:23:46 GMT
• Title: Two-dimensional Si spin qubit arrays with multilevel interconnects
• Authors: Sieu D. Ha, Edwin Acuna, Kate Raach, Zachery T. Bloom, Teresa L. Brecht, James M. Chappell, Maxwell D. Choi, Justin E. Christensen, Ian T. Counts, Dominic Daprano, J. P. Dodson, Kevin Eng, David J. Fialkow, Christina A. C. Garcia, Wonill Ha, Thomas R. B. Harris, nathan holman, Isaac Khalaf, Justine W. Matten, Christi A. Peterson, Clifford E. Plesha, Matthew J. Ruiz, Aaron Smith, Bryan J. Thomas, Samuel J. Whiteley, Thaddeus D. Ladd, Michael P. Jura, Matthew T. Rakher, Matthew G. Borselli,
• Abstract summary: We show an extendable two-dimensional array of spins with fully controllable nearest-neighbor exchange interactions.<n>With spin connectivity in two dimensions, we show that both linear and right-angle exchange-only qubits with high performance can be formed.<n>This extendable device platform demonstrates that industrial manufacturing techniques can be leveraged for scalable spin qubit technologies.
• Score: 0.5544477483066056
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The promise of quantum computation is contingent upon physical qubits with both low gate error rate and broad scalability. Silicon-based spins are a leading qubit platform, but demonstrations to date have not utilized fabrication processes capable of extending arrays in two dimensions while maintaining complete control of individual spins. Here, we implement an interconnect process, common in semiconductor manufacturing, with multiple back-end-of-line layers to show an extendable two-dimensional array of spins with fully controllable nearest-neighbor exchange interactions. In a device using three interconnect layers, we encode exchange-only qubits and achieve average single-qubit gate fidelities consistent with single-layer devices, including fidelities greater than 99.9%, as measured by blind randomized benchmarking. Moreover, with spin connectivity in two dimensions, we show that both linear and right-angle exchange-only qubits with high performance can be formed, enabling qubit array reconfigurability in the presence of defects. This extendable device platform demonstrates that industrial manufacturing techniques can be leveraged for scalable spin qubit technologies.

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