Electric-field noise from carbon-adatom diffusion on a Au(110) surface: First-principles calculations and experiments

Kim, E.; Safavi-Naini, A.; Hite, D. A.; McKay, K. S.; Pappas, D. P.; Weck, P. F.; Sadeghpour, H. R.

doi:10.1103/PhysRevA.95.033407

Electric-field noise from carbon-adatom diffusion on a Au(110) surface: First-principles calculations and experiments

Journal Article · Wed Mar 01 04:00:00 EST 2017 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.95.033407· OSTI ID:1336362

Kim, E.; Safavi-Naini, A.; Hite, D. A.; McKay, K. S.; Pappas, D. P.; Weck, P. F.; Sadeghpour, H. R.

The decoherence of trapped-ion quantum bits due to heating of their motional modes is a fundamental science and engineering problem. This heating is attributed to electric-field noise arising from processes on the trap-electrode surfaces. In this work, we address the source of this noise by focusing on the diffusion of carbon-containing adsorbates on the surface of Au(110). We show by detailed scanned probe microscopy and density functional theory how the carbon adatom diffusion on the gold surface changes the energy landscape, and how the adatom dipole moment varies with the diffusive motion. Lastly, a simple model for the diffusion noise, which varies quadratically with the variation of the dipole moment, qualitatively reproduces the measured noise spectrum, and the estimate of the noise spectral density is in accord with measured values.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1336362

Alternate ID(s):: OSTI ID: 1346432

Report Number(s):: SAND2016-8969J; 647315

Journal Information:: Physical Review A, Journal Name: Physical Review A Journal Issue: 3 Vol. 95; ISSN PLRAAN; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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