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

Journal Article · · Physical Review A

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.

Research Organization:
Sandia National Lab. (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; PLRAAN; 647315
Journal Information:
Physical Review A, Vol. 95, Issue 3; ISSN 2469-9926
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (10)

Trapped-ion quantum computing: Progress and challenges journal June 2019
Crystallographic orientation dependence of work function: carbon adsorption on Au surfaces journal February 2019
Radio-frequency microplasmas with energies suited to in situ selective cleaning of surface adsorbates in ion microtraps journal February 2019
van der Waals-corrected density functional study of electric field noise heating in ion traps caused by electrode surface adsorbates journal May 2019
Crystallographic orientation dependence of work function: carbon adsorption on Au surfaces text January 2019
Crystallographic orientation dependence of work function: carbon adsorption on Au surfaces text January 2019
Distance scaling of electric-field noise in a surface-electrode ion trap text January 2017
Evidence for multiple mechanisms underlying surface electric-field noise in ion traps text January 2018
Crystallographic orientation dependence of work function: Carbon adsorption on Au surfaces text January 2019
Distance scaling and polarization of electric-field noise in a surface ion trap text January 2019