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Theorists show which quantum systems are suitable for quantum simulations



Theorists show which quantum systems are suitable for quantum simulations

Supercold atoms in an optical lattice are considered for quantum simulations. Credit: arö / HZB

A joint research group led by Prof. Jens Eisert of the Freie Universität Berlin and the Helmholtz-Zentrum Berlin (HZB) showed a way to simulate the quantum physical properties of complex systems in the solid state. This is done using complex solid-state systems that can be studied experimentally. The study was published in the famous journal Notices of the National Academy of Sciences (PNAS).


“The real goal is a stable quantum computer that generates stable results, even when errors occur, and corrects these errors,”

; explains Jens Eisert, a professor at the Freie Universität Berlin and head of a joint research group at HZB. So far, the development of robust quantum computers is still a long way off, because quantum bits are extremely sensitive to the slightest fluctuations in environmental parameters.

But now a new approach can promise success: two PhD students from the group around Jens Eisert, Maria Laura Baez and Marek Gluza, have embraced the idea of ​​Richard Feynman, a brilliant post-war American physicist. Feynman had proposed using real systems of atoms with their quantum physical properties to simulate other quantum systems. These quantum systems can consist of atoms strung together like beads in a string with special spin properties, but they can also be ion traps, Rydberg atoms, superconducting Qbits, or atoms in optical lattices. What they have in common is that they can be created and controlled in the laboratory. Their quantum physical properties can be used to predict the behavior of other quantum systems. But which quantum systems would be good candidates? Is there a way to find out in advance?

The Eisert team has now explored this issue using a combination of mathematical and numerical methods. In fact, the group has shown that the so-called dynamic structural factor of such systems is a possible tool for expressing other quantum systems. This factor indirectly shows how the spins or other quantum quantities behave over time, it is calculated by Fourier transform.

“This work builds a bridge between two worlds,” explains Jens Eisert. “On the one hand, there is the community of condensed matter, which studies quantum systems and gains new insights from them – and on the other hand, there is quantum informatics – which deals with quantum information. We believe that great progress will be possible if the two worlds come together. together, “says the scientist.


The mathematical tool helps to calculate the properties of quantum materials faster


More information:
Maria Laura Baez et al, Dynamic structural factors of dynamic quantum simulators, Notices of the National Academy of Sciences (2020). DOI: 10.1073 / pnas.2006103117

Provided by the Helmholtz Association of German Research Centers

Quote: Theorists show which quantum systems are suitable for quantum simulations (2020, October 27), extracted on October 28, 2020 from https://phys.org/news/2020-10-theoreticians-quantum-suitable-simulations. html

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