Shaping the Hamiltonian Ultracold atoms have proven to be a versatile setting for simulating more complicated quantum systems. However, the type of the simulated Hamiltonian usually cannot be changed once the system has been engineered, although the parameters can be tuned. Geier et al . used rubidium-87 atoms in two excited Rydberg states to create a system in which the type of the Hamiltonian could be modified by periodic driving. The researchers started with a system that was initially described by the so-called Heisenberg XX Hamiltonian. By using a periodic series of pulses, the Hamiltonian was transformed into a different target Hamiltonian, which was corroborated by monitoring the system’s dynamics. —JS

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