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Electric-field noise from thermally-activated fluctuators in a surface ion trap
- Source :
- Phys. Rev. A 99, 063427 (2019)
- Publication Year :
- 2018
-
Abstract
- We probe electric-field noise near the metal surface of an ion trap chip in a previously unexplored high-temperature regime. We observe a non-trivial temperature dependence with the noise amplitude at 1-MHz frequency saturating around 500~K. Measurements of the noise spectrum reveal a $1/f^{\alpha\approx1}$-dependence and a small decrease in $\alpha$ between low and high temperatures. This behavior can be explained by considering noise from a distribution of thermally-activated two-level fluctuators with activation energies between 0.35~eV and 0.65~eV. Processes in this energy range may be relevant to understanding electric-field noise in ion traps; for example defect motion in the solid state and surface adsorbate binding energies. Studying these processes may aid in identifying the origin of excess electric-field noise in ion traps -- a major source of ion motional decoherence limiting the performance of surface traps as quantum devices.<br />Comment: Version accepted by PRA, significantly expanded compared to v1
- Subjects :
- Quantum Physics
Physics - Atomic Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. A 99, 063427 (2019)
- Publication Type :
- Report
- Accession number :
- edsarx.1809.05624
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevA.99.063427