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  • Letter
  • Open Access

Observation of second- and higher-order electric quadrupole interactions with an atomic ion

Gerard Higgins*, Chi Zhang†, Fabian Pokorny‡, Harry Parke, Erik Jansson§, Shalina Salim, and Markus Hennrich∥

  • Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden

  • *Present address: Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Vienna, Austria; higgins@chalmers.se
  • †Present address: Centre for Cold Matter, Imperial College London, London, UK; c.zhang@imperial.ac.uk
  • ‡Present address: Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, England, United Kingdom.
  • §Present address: Physikalisch-Technische Bundesanstalt, DE-38116 Braunschweig, Germany.
  • ∥markus.hennrich@fysik.su.se
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Phys. Rev. Research 3, L032032 – Published 2 August, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L032032

Abstract

We observe an atomic ion's response to an electric quadrupole field to second and higher orders; this arises from the ion's electric quadrupole polarizability and hyperpolarizabilities. We probe a single Sr+88 ion which is confined in the electric fields of a Paul trap and excited to Rydberg states. The quadrupolar trapping fields cause atomic energy level shifts and give rise to spectral sidebands. The effects on Rydberg S1/2 states are described well by second-order perturbation calculations. The stronger effects on Rydberg P1/2 states are captured by full diagonalization of the Hamiltonian.

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References (44)

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Outline

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Phys. Rev. Research 3, L032032– Published 2 August, 2021
  • Received 6 May 2020
  • Accepted 7 July 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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