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Fast quantum gates for neutral atoms separated by a few tens of micrometers

Matteo Bergonzoni1,*, Rosario Roberto Riso1,2, and Guido Pupillo1,†

  • *Contact author: bergonzoni@unistra.fr
  • †Contact author: pupillo@unistra.fr
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Phys. Rev. Research 8, 033319 – Published 15 September, 2026

DOI: https://doi.org/10.1103/hjrh-4327

Abstract

We present a theoretical scheme for a family of fast and high-fidelity two-qubit iswap gates between neutral atoms separated by more than 20µm, enabled by resonant dipole-dipole spin-exchange interactions between Rydberg states. The protocol harnesses coherent excitation-exchange-deexcitation dynamics between the qubit and the Rydberg states within a single and smooth laser pulse, in the presence of strong dipole-dipole interactions. We utilize optimal control methods to achieve theoretical gate fidelities and durations comparable to blockade-based gates in the presence of relevant noise, while extending the effective interaction range by an order of magnitude. This enables entanglement well beyond the blockade radius, offering a route toward fast, high-connectivity quantum processors.

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Phys. Rev. Research 8, 033319– Published 15 September, 2026
  • Received 30 November 2025
  • Revised 6 February 2026
  • Accepted 13 April 2026
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