Scalable Quantum Computation with Rydberg–Landau Atoms

Rydberg atoms are a leading platform for quantum engineering[1-17], but their short lifetimes, ionization sensitivity, and large interatomic spacing limit scalability. We propose Rydberg–Landau (rLandau) states, engineered by applying a strong magnetic field (~2.5 T) to reshape electronic wavefunctions [18]. The resulting “magnetic cage” squeezes the electron radially, suppressing ionization and electron exchange, while preserving long-range dipolar interactions. This enables denser qubit arrays with all-to-all connectivity and lifetimes up to two orders of magnitude longer than conventional Rydberg states. We characterize rLandau wavefunctions, excitation pathways, dipole selection rules, and interactions, highlighting circular rLandau states that are both long-lived and coherently accessible. These features overcome key bottlenecks of current Rydberg processors, paving the way toward scalable, high-fidelity quantum computation and deeper quantum algorithms on atomic platforms.

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