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Ground state cooling of weakly-coupled trapped-ion motion using parametric coupling

ORAL

Abstract

Laser cooling of trapped-ion motional degrees of freedom to near their ground state is crucial for high-fidelity quantum information applications and high-precision quantum metrology. However certain motional degrees of freedom are weakly coupled to the available cooling light due to geometrical constraints or weak mode participation of the cooling ions. We overcome these obstacles by using parametric coupling to exchange motional energy between modes that are weakly and strongly coupled to the cooling light respectively. In this way we demonstrate cooling to near the ground state of some weakly coupled modes in Be+-Be+ and Be+-Mg+ two-ion crystals. In a Be+-Mg+-Be+ crystal, we cool all three axial modes to near the ground state using only the Mg+ ion, even though this ion does not participate in the stretch mode of this symmetric crystal. This method may be useful for efficient cooling of Coulomb-crystals of many charged species, including molecular ions and highly charged ions.

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Presenters

  • Giorgio Zarantonello

    NIST/University of Colorado at Boulder, NIST / University of Colorado, Boulder

Authors

  • Giorgio Zarantonello

    NIST/University of Colorado at Boulder, NIST / University of Colorado, Boulder

  • Pan-Yu Hou

    NIST/University of Colorado at Boulder

  • Jenny Wu

    NIST/University of Colorado at Boulder, NIST / University of Colorado, Boulder

  • Stephen D Erickson

    University of Colorado, Boulder, NIST / University of Colorado, Boulder, NIST/University of Colorado at Boulder

  • Daniel C Cole

    National Institute of Standards and Technology Boulder

  • Adam Brandt

    Colorado State University, University of Colorado Boulder, NIST/University of Colorado at Boulder, NIST / University of Colorado, Boulder

  • 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

  • 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

  • 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