Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 25: Quantum gases (Bosons) IV
Q 25.3: Talk
Wednesday, March 11, 2020, 11:30–11:45, e214
Dynamical structure factors of dynamical quantum simulators — Maria Laura Baez1,2, Marcel Goihl2, Jonas Haferkamp2, Juan Bermejo-Veja2,3, •Marek Gluza2, and Jens Eisert2,4 — 1Max Planck Institute for the physics of complex systems, Dresde, Germany — 2Dahlem Center for Complex Quantum Systems, Berlin, Germany — 3Institute for Theoretical and Computational Physics, Granada, Spain — 4Helmholtz-Zentrum Berlin für Materialien und Energie, Germany
The dynamical structure factor is one of the experimental quantities crucial in scrutinizing the validity of the microscopic description of strongly correlated systems. Despite its long-standing importance, it is exceedingly difficult in generic cases to numerically calculate it, ensuring that the necessary approximations involved yield a correct result. We discuss in what way results on the hardness of classically tracking time evolution under local Hamiltonians are precisely inherited by dynamical structure factors; and hence offer in the same way the potential computational capabilities as dynamical quantum simulators do. Furthermore, we improve upon a novel, readily available, measurement setup allowing for the determination of the dynamical structure factor in different architectures, including arrays of ultra-cold atoms, trapped ions, Rydberg atoms, and superconducting qubits. Our results suggest that quantum simulations employing near-term quantum devices allow for the observation of dynamical structure factors of correlated quantum matter in the presence of experimental imperfections, for larger system sizes than what is achievable by classical simulation.