We systematically test a quasiclassical spin model of a large spin lattice in energy space, with a tunable, reversible Hamiltonian and effective long-range interactions. The system is simulated by a weakly interacting Fermi gas undergoing perturbed quantum rewinding using rf pulses. With single-shot analysis techniques, the measurement of energy-resolved spin density quantitatively substantiates the classical treatment of this many-body spin system. This work also elucidates the effects of rf detunings on the system and measurements, pointing the way to new correlation measurement methods.

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• Fermi gases
• Quantum spin models