Quantum

Resonant pair production and flat band melting in a driven Rydberg chain

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Briefings

A driven Rydberg chain under two-tone periodic drive exhibits an exact Floquet flat band in the strong blockade limit. Analysis using time-dependent Schrieffer-Wolff transformation and Floquet perturbation theory identifies two mechanisms for flat band melting: resonant pair production and virtual processes accessing intermediate states. The study compares analytical results with exact diagonalization on finite chains and examines dynamics for three specific initial Fock states.

Key points

• The system reduces to the PXP model and exhibits an exact Floquet flat band in the strong Rydberg blockade limit.
• Floquet perturbation theory identifies two distinct mechanisms for flat band melting: resonant pair production and virtual processes accessing intermediate states.

Context

This research investigates the stability of flat bands in driven Rydberg chains, a system relevant to quantum simulation and many-body physics where blockade effects are crucial.

Limitations

Results are limited to analytical FPT and exact diagonalization on finite chains; no experimental validation or long-term stability data is provided.

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