Quantum computation of magnon spectra

ORAL

Abstract

We demonstrate quantum computation of two-point correlation functions for a Heisenberg spin chain. Using the IBM Q 20 Tokyo machine, we find that for two sites the correlation functions produce the exact results reliably. For four sites, results from the quantum computer are noisy due to read out errors and decoherence. Nevertheless, the correlation functions retain the correct spectral information. This is illustrated in the frequency domain by accurately extracting the magnon energies from peaks in the spectral function.

*This work was supported by the Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Grant No. DE-SC0019469. J. K. F. was also supported by the McDevitt bequest at Georgetown University.

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Presenters

  • AKHIL FRANCIS

    • North Carolina State University

Authors

  • AKHIL FRANCIS

    • North Carolina State University

  • James Freericks

    • Physics, Georgetown University
    • Georgetown University
    • Department of Physics, Georgetown University

  • Alexander F Kemper

    • Department of Physics, North Carolina State University
    • North Carolina State University
    • Physics, North Carolina State University