Dynamical structure factors of dynamical quantum simulators
| Autor: | Jens Eisert, Juani Bermejo-Vega, Maria Laura Baez, Jonas Haferkamp, Marek Gluza, Marcel Goihl |
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| Rok vydání: | 2020 |
| Předmět: |
Electronic structure
Structure (category theory) Quantum simulator FOS: Physical sciences quantum simulation dynamical structure factor Rydberg atoms trapped ions 01 natural sciences 010305 fluids & plasmas Condensed Matter - Strongly Correlated Electrons 0103 physical sciences Trapped ions Statistical physics 010306 general physics Time complexity Quantum Physics Quantum Physics Multidisciplinary Strongly Correlated Electrons (cond-mat.str-el) 500 Naturwissenschaften und Mathematik::530 Physik::530 Physik Time evolution Dynamical structure factor Qubit Rydberg atom Physical Sciences Quantum simulation Structure factor Quantum Physics (quant-ph) |
| Zdroj: | PNAS Proceedings of the National Academy of Sciences of the United States of America Digibug. Repositorio Institucional de la Universidad de Granada instname Digibug: Repositorio Institucional de la Universidad de Granada Universidad de Granada (UGR) |
| Popis: | The dynamical structure factor is one of the experimental quantities crucial in scrutinizing the validity of the microscopic description of strongly correlated systems. However, 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. Acknowledging this practical difficulty, 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 that dynamical quantum simulators do: We argue that practically accessible variants of the dynamical structure factors are bounded-error quantum polynomial time (BQP)-hard for general local Hamiltonians. Complementing these conceptual insights, 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 noisy intermediate-scale quantum devices should allow for the observation of features 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. European Research Council (Taming Non-Equilibrium Quantum Systems) Templeton Foundation Foundational Questions Institute German Research Foundation (DFG) EI 519/14-1 EI 519/15-1 CRC 183 FOR 2724 MATH+ European Union Horizon 2020 research and innovation program 817482 European Union (EU) 754446 University of Granada Research and Knowledge Transfer Fund-Athenea3i |
| Databáze: | OpenAIRE |
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