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Protected Quantum Gates Using Qubit Doublons in Dynamical Optical Lattices

Researchers have demonstrated protected two‑qubit gates that exploit qubit doublons—paired fermionic atoms—in a dynamically driven optical lattice. By periodically modulating the lattice depth, the doublon states become immune to motional dephasing, delivering gate fidelities exceeding 99.9%. The technique integrates seamlessly with existing neutral‑atom array platforms and scales to hundreds of qubits using programmable superlattice geometries. The work marks a significant step toward fault‑tolerant, large‑scale quantum processors based on ultracold atoms.