Neutral atom quantum computing uses individual atoms (typically rubidium-87, cesium-133, strontium-88, or ytterbium-171) held in place by tightly focused laser beams called optical tweezers. Each atom acts as a qubit with information encoded in hyperfine ground states or nuclear spin states. Companies like QuEra Computing and Pasqal are leading commercial development, building on decades of atomic physics research.
A defining advantage of neutral atom systems is geometric flexibility — optical tweezers can arrange atoms in arbitrary 1D, 2D, or 3D patterns and dynamically rearrange them during computation. Two-qubit gates are performed by exciting atoms to Rydberg states (highly excited electronic states with large electron orbits), which create strong, long-range interactions between nearby atoms. This Rydberg blockade mechanism naturally implements controlled-Z gates between any pair of atoms within the blockade radius, enabling flexible connectivity without the fixed topology constraints of superconducting processors.
Neutral atom systems have demonstrated rapid scaling, with arrays exceeding 1,000 atoms already demonstrated in academic settings. QuEra's roadmap targets 10,000+ qubits within a few years. Gate fidelities have improved significantly, with two-qubit Rydberg gate fidelities reaching 99.5% and climbing. The technology is particularly well-suited for quantum error correction because atoms can be physically rearranged to match the connectivity requirements of QEC codes, and mid-circuit measurement can be performed by selectively imaging specific atoms while shelving others in dark states.