Changes in electric field noise due to thermal transformation of a surface ion trap

Maya Berlin-Udi, Clemens Matthiesen, P. N. Thomas Lloyd, Alberto M. Alonso, Crystal Noel, Benjamin Saarel, Christine A. Orme, Chang-Eun Kim, Art J. Nelson, Keith G. Ray, Vincenzo Lordi, and Hartmut Häffner
Phys. Rev. B 106, 035409 – Published 11 July 2022

Abstract

We aim to illuminate how the microscopic properties of a metal surface map to its electric field noise characteristics. In our system, prolonged heat treatments of a metal film can induce a rise in the magnitude of the electric field noise generated by the surface of that film. We refer to this heat-induced rise in noise magnitude as a thermal transformation. The underlying physics of this thermal transformation process is explored through a series of heating, milling, and electron treatments performed on a single surface ion trap. Between these treatments, Ca+40 ions trapped 70 μm above the surface of the metal are used as detectors to monitor the electric field noise at frequencies close to 1 MHz. An Auger spectrometer is used to track changes in the composition of the contaminated metal surface. With these tools we investigate contaminant deposition, chemical reactions, and atomic restructuring as possible drivers of thermal transformations.

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  • Received 8 March 2021
  • Revised 22 April 2022
  • Accepted 22 June 2022

DOI:https://doi.org/10.1103/PhysRevB.106.035409

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Maya Berlin-Udi1,2, Clemens Matthiesen1, P. N. Thomas Lloyd1,*, Alberto M. Alonso1,2, Crystal Noel1,†, Benjamin Saarel1,2, Christine A. Orme3, Chang-Eun Kim3, Art J. Nelson3, Keith G. Ray3, Vincenzo Lordi3, and Hartmut Häffner1,2,‡

  • 1Department of Physics, University of California, Berkeley, California 94720, USA
  • 2Challenge Institute for Quantum Computation, University of California, Berkeley, California 94720, USA
  • 3Lawrence Livermore National Laboratory, Livermore, California 94551, USA

  • *Current address: Department of Physics, University of California, Santa Barbara, California 93106, USA.
  • Current address: Duke Quantum Center, Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA.
  • hhaeffner@berkeley.edu

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Issue

Vol. 106, Iss. 3 — 15 July 2022

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