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  • Letter
  • Open Access

Low-excitation transport and separation of high-mass-ratio mixed-species ion chains

F. Lancellotti1,*, S. Welte1,†, M. Simoni1, C. Mordini1, T. Behrle1, B. de Neeve1, M. Marinelli1,‡, V. Negnevitsky1,§, and J. P. Home1,2,∥

  • 1Institute for Quantum Electronics, ETH Zürich, Otto-Stern-Weg 1, 8093 Zürich, Switzerland
  • 2Quantum Center, ETH Zürich, 8093 Zürich, Switzerland

  • *Contact author: flancell@phys.ethz.ch
  • †Contact author: weltes@phys.ethz.ch
  • ‡Present address: JILA, Boulder, Colorado, USA.
  • §Present address: Oxford Ionics, Oxford OX5 1PF, United Kingdom.
  • ∥Contact author: jhome@phys.ethz.ch
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Phys. Rev. Research 6, L032059 – Published 10 September, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L032059

Abstract

We demonstrate low-excitation transport and separation of two-ion crystals consisting of one Be+9 and one Ca+40 ion, with a high mass ratio of 4.4. The full separation involves transport of the mixed-species chain, splitting each ion into separate potential wells, and then transport of each ion prior to detection. We find the high mass ratio makes the protocol sensitive to mode crossings between axial and radial modes, as well as to uncontrolled radial electric fields that induce mass-dependent twists of the ion chain, which initially gave excitations n¯≫10. By controlling these stages, we achieve excitation as low as n¯=1.40±0.08phonons for the calcium ion and n¯=1.44±0.09phonons for the beryllium ion. Separation and transport of mixed-species chains are key elements of the quantum charge-coupled device architecture and may also be applicable to quantum-logic-based spectroscopy of exotic species.

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Phys. Rev. Research 6, L032059– Published 10 September, 2024
  • Received 22 December 2023
  • Accepted 1 August 2024
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