Electric-field noise from carbon-adatom diffusion on a Au(110) surface: First-principles calculations and experiments
Abstract
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.
- Authors:
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1336362
- Alternate Identifier(s):
- OSTI ID: 1346432
- Report Number(s):
- SAND2016-8969J
Journal ID: ISSN 2469-9926; PLRAAN; 647315
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review A
- Additional Journal Information:
- Journal Volume: 95; Journal Issue: 3; Journal ID: ISSN 2469-9926
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Kim, E., Safavi-Naini, A., Hite, D. A., McKay, K. S., Pappas, D. P., Weck, P. F., and Sadeghpour, H. R. Electric-field noise from carbon-adatom diffusion on a Au(110) surface: First-principles calculations and experiments. United States: N. p., 2017.
Web. doi:10.1103/PhysRevA.95.033407.
Kim, E., Safavi-Naini, A., Hite, D. A., McKay, K. S., Pappas, D. P., Weck, P. F., & Sadeghpour, H. R. Electric-field noise from carbon-adatom diffusion on a Au(110) surface: First-principles calculations and experiments. United States. https://doi.org/10.1103/PhysRevA.95.033407
Kim, E., Safavi-Naini, A., Hite, D. A., McKay, K. S., Pappas, D. P., Weck, P. F., and Sadeghpour, H. R. Wed .
"Electric-field noise from carbon-adatom diffusion on a Au(110) surface: First-principles calculations and experiments". United States. https://doi.org/10.1103/PhysRevA.95.033407. https://www.osti.gov/servlets/purl/1336362.
@article{osti_1336362,
title = {Electric-field noise from carbon-adatom diffusion on a Au(110) surface: First-principles calculations and experiments},
author = {Kim, E. and Safavi-Naini, A. and Hite, D. A. and McKay, K. S. and Pappas, D. P. and Weck, P. F. and Sadeghpour, H. R.},
abstractNote = {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.},
doi = {10.1103/PhysRevA.95.033407},
journal = {Physical Review A},
number = 3,
volume = 95,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}
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