Fast quantum gates for neutral atoms separated by a few tens of micrometers
Matteo Bergonzoni, Rosario R. Riso, Guido Pupillo · Physical Review Research · 2026
We present a theoretical scheme for a family of fast and high-fidelity two-qubit gates between neutral atoms separated by more than 20 µ m , 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.