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| Hauptseite > Publikationsdatenbank > Optimizing two-qubit gates for ultracold atoms using Fermi-Hubbard models |
| Hauptseite > Publikationsdatenbank > Optimizing two-qubit gates for ultracold atoms using Fermi-Hubbard models |
| Journal Article | FZJ-2026-02218 |
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2025
American Physical Society
College Park, Md. [u.a.]
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Please use a persistent id in citations: doi:10.1103/xqzw-m27l doi:10.34734/FZJ-2026-02218
Abstract: Ultracold atoms trapped in optical lattices have emerged as a scalable and promising platform forquantum simulation and computation; however, gate speeds remain a significant limitation for practicalapplications. In this work, we employ quantum optimal control to design fast, collision-based two-qubitgates within a superlattice based on a Fermi-Hubbard description, reaching errors in the range 10−3 forrealistic parameters. Numerically optimizing the lattice depths and the scattering length, we effectivelymanipulate hopping and interaction strengths intrinsic to the Fermi-Hubbard model. Our results providefive times shorter gate durations by allowing for higher energy bands in the optimization, suggesting thatstandard modeling with a two-band Fermi-Hubbard model is insufficient for describing the dynamics offast gates, and we find that four to six bands are required. Additionally, we achieve nonadiabatic gatesby employing time-dependent lattice depths rather than using only fixed depths. The optimized controlpulses not only maintain high efficacy in the presence of laser-intensity and phase noise but also result innegligible interwell couplings.
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