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Towards a scalable mixed-species ion trap quantum computer with one laser-free species

ORAL

Abstract

We discuss progress towards implementing mixed species operation of Ca+-Mg+ ion crystals in a surface-electrode radio-frequency trap. By utilizing quantum logic spectroscopy techniques, the ‘helper’ Ca+ ion can be used to sympathetically cool, prepare a hyperfine ground state of, and non-destructively read out the ‘data’ Mg+ ion [1]. Universal laser-free control of single and multiple Mg+ ions [2], as well as laser-free Ca+-Mg+ entangling operations, are performed using trap-integrated microwave electrodes. Laser-free addressing of individual ions in a trap zone, or controllable sets of ions in multiple zones, can be used to perform simultaneous operations in parallel on many qubits. By removing the need for lasers addressing the Mg+ ion, trap charging due to ultraviolet light and damage to the ‘data’ ion from resonant light crosstalk can both be eliminated.

[1] P. O. Schmidt, T. Rosenband, C. Langer, W. M. Itano, J. C. Bergquist, and D. J. Wineland. Spectroscopy using quantum logic. Science 309, 749 (2005).

[2] R. Srinivas et al. High-fidelity laser-free universal control of trapped ion qubits. Nature 597, 209–213 (2021)

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Presenters

  • Alejandra L Collopy

    National Institute of Standards and Tech, National Institute of Standards and Technology, Boulder, CO 80305, USA

Authors

  • Alejandra L Collopy

    National Institute of Standards and Tech, National Institute of Standards and Technology, Boulder, CO 80305, USA

  • Hannah M Knaack

    University of Colorado, Boulder, National Institute of Standards and Technology, Boulder, CO 80305, USA and Department of Physics, University of Colorado, Boulder, CO 80309, USA

  • Laurent Stephenson

    National Institute of Standards and Tech, National Institute of Standards and Technology Boulder, National Institute of Standards and Technology, Boulder, CO 80305, USA and Department of Physics, University of Colorado, Boulder, CO 80309, USA

  • Robert T Sutherland

    University of Texas at San Antonio, University of Texas at San Antonio, San Antonio, Texas 78249, USA, Lawrence Livermore Natl Lab

  • Stephen B Libby

    Lawrence Livermore National Laboratory, Livermore, CA 94550, USA

  • David T Allcock

    University of Oregon, Eugene, OR 97403, USA, University of Oregon

  • John Chiaverini

    Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, MA 02421, USA, MIT Lincoln Lab, MIT Lincoln Lab; MIT Research Laboratory for Electronics

  • Andrew C Wilson

    National Institute of Standards and Technology, National Institute of Standards and Technology Boulder, National Institute of Standards and Technology, Boulder, CO 80305, USA

  • Dietrich Leibfried

    National Institute of Standards and Technology Boulder, National Institute of Standards and Tech, National Institute of Standards and Technology, National Institute of Standards and Technology (NIST) Boulder, National Institute of Standards and Technology, Boulder, CO 80305, USA

  • Daniel H Slichter

    National Institute of Standards and Technology, National Institute of Standards and Technology Boulder, National Institute of Standards and Technology, Boulder, CO 80305, USA