Hybrid Analog-Digital Quantum Simulation with Ultracold Fermions

IQOQI Quantum Seminar

Analog quantum simulators provide access to large, coherent quantum systems with strong correlations and large-scale entanglement. However, unlike digital quantum computers, optical lattice simulators generally lack programmable state preparation and universal readout protocols for accessing arbitrary observables.

In this talk, I will present novel approaches that integrate optical lattice implementations of Fermi–Hubbard systems with gate-based methods for state initialization and readout. I will discuss how stroboscopic lattice operations can implement arbitrary unitaries and establish connections to molecular structure calculations. We show that optical superlattices provide all the resources needed to implement state-of-the-art optimization algorithms from quantum chemistry [1]. As a first experimental step toward such gate-based manipulation of correlated states of fermionic atoms, we have recently demonstrated high-fidelity collisional gates in optical superlattices [2].

This approach has promising applications for quantum information processing with fermions, including materials science and fermionic quantum computing.

[F. Gkristis et al., PRX Quantum 6, 010318 (2025)]
[P. Bojović et al., arXiv:2506.14711 (2025)]

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