Quantum computation of magnon spectra

Francis, Akhil; Freericks, J. K.; Kemper, A. F.

doi:10.1103/PhysRevB.101.014411

Title: Quantum computation of magnon spectra

Journal Article · Thu Jan 09 00:00:00 EST 2020 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.101.014411· OSTI ID:1582306

Francis, Akhil ^[1]; Freericks, J. K. ^[2];

^[1]

North Carolina State Univ., Raleigh, NC (United States)
Georgetown Univ., Washington, DC (United States)

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

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Research Organization:: North Carolina State University, Raleigh, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0019469

OSTI ID:: 1582306

Journal Information:: Physical Review B, Vol. 101, Issue 1; Related Information: https://osf.io/9gx7u; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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References (15)

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