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SpinHex: A low-crosstalk, spin-qubit architecture based on multielectron couplers

Rubén M. Otxoa1,*, Josu Etxezarreta Martinez2,3, Paul Schnabl2, Javier Oliva del Moral2,4, Normann Mertig1, Charles Smith1, and Frederico Martins1

  • *Contact author: ruben.otxoa@hitachi-eu.com
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Phys. Rev. Research 8, 043100 – Published 29 October, 2026

DOI: https://doi.org/10.1103/t2ry-ll9n

Abstract

Semiconductor spin qubits are an attractive quantum computing platform that offers long qubit coherence times and compatibility with existing semiconductor fabrication technology for scale-up. Here, we propose a spin-qubit architecture based on spinless multielectron quantum dots that act as low-crosstalk couplers between a two-dimensional arrangement of spin qubits in a hexagonal lattice. The multielectron couplers are controlled by voltage signals, which mediate fast Heisenberg exchange and thus enable coherent multiqubit operations. For the proposed architecture, we discuss the implementation of the rotated XZZX surface code and numerically study its performance for a circuit-level noise model. We predict a threshold of 0.18% for the error rate of the entangling gates. We further evaluate the scalability of the proposed architecture and predict the need for 4480 physical qubits per logical qubit with logical error rates of 10−12 considering entangling gate fidelities of 99.99%, resulting in a chip size of 2.6cm2 to host 10 000 logical qubits.

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Phys. Rev. Research 8, 043100– Published 29 October, 2026
  • Received 26 August 2025
  • Accepted 17 June 2026
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