Cavallar, Alberto R.Alberto R.CavallarEscalera Moreno, LuisLuisEscalera MorenoFranz, TitusTitusFranzHilker, TimonTimonHilkerCirac, J. IgnacioJ. IgnacioCiracPreiss, Philipp M.Philipp M.PreissSchiffer, Benjamin F.Benjamin F.Schiffer2026-05-272026-05-272025-05-12Quantum 10: 2103 (2026)https://hdl.handle.net/11420/63228Fermionic quantum processors are a promising platform for quantum simulation of correlated fermionic matter. In this work, we study a hardware-efficient protocol for measuring complex expectation values of the time-evolution operator, commonly referred to as Loschmidt echoes, with fermions in an optical superlattice. We analyze the algorithm for the Fermi–Hubbard model at half-filling as well as at finite doping. The method relies on global quench dynamics and short imaginary time evolution, the latter being realized by architecture-tailored pulse sequences starting from a product state of plaquettes. Our numerical results show that complex-valued Loschmidt echoes can be efficiently obtained for large many-body states over a broad spectral range. This allows one to measure spectral properties of the Fermi–Hubbard model, such as the local density of states, and paves the way for the study of finite-temperature properties in current fermionic quantum simulators.en2521-327X2025Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaftenhttps://creativecommons.org/licenses/by/4.0/Natural Sciences and Mathematics::539: Matter; Molecular Physics; Atomic and Nuclear physics; Radiation; Quantum PhysicsJournal Articlehttps://doi.org/10.15480/882.1719910.22331/q-2026-05-12-210310.15480/882.171992509.01637