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Crosstalk-mitigated microelectronic control for optically active spins

Hao-Cheng Weng*, John G. Rarity, and Krishna C. Balram

Joe A. Smith†

  • Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1TL, United Kingdom

  • School of Electrical and Electronic Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom and
  • Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1TL, United Kingdom

  • *Contact author: haocheng.weng@bristol.ac.uk
  • †Contact author: joe.a.smith@sheffield.ac.uk
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Phys. Rev. Applied 25, 024025 – Published 9 February, 2026

DOI: https://doi.org/10.1103/stgn-ysxr

Abstract

To exploit the subnanometer dimensions of qubits for large-scale quantum information processing, corresponding control architectures require both energy and space efficiency, with the on-chip footprint of unit-cell electronics ideally being micrometer scale; however, the spin coherence of qubits in close packing is severely deteriorated by microwave crosstalk from neighboring control sites. Here, we present a crosstalk-mitigation scheme using foundry microelectronics to address solid-state spins at sub-100-μm spacing without the need for qubit detuning. Using nitrogen-vacancy centers in nanodiamonds as qubit prototypes, we first demonstrate 10-MHz Rabi oscillations at milliwatt-level microwave power. By implementing active cancellation, we then demonstrate that the crosstalk field from neighboring lattice sites can be reduced to undetectable levels. We finally extend the scheme to show increased qubit control, or, effectively, enhanced spin coherence under crosstalk mitigation. Compatible with integrated optics, our results present a step toward scalable control across quantum platforms using silicon microelectronics.

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Phys. Rev. Applied 25, 024025– Published 9 February, 2026
  • Received 12 July 2025
  • Revised 1 November 2025
  • Accepted 23 December 2025
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