Normal Modes and Gates in Interspecies Trapped-Ion Chains

POSTER

Abstract

Scaling up ion trap quantum information processors will likely require at least two co-trapped ion species. Using different species for computation and for sympathetic cooling or photonic interconnects provides spectral isolation that prevents decoherence of the computation ion. However, the different charge to mass ratios of distinct ion species cause their motion to decouple in the radial normal modes that are often used for entangling gates in trapped-ion systems. This decoupling increases the required laser power for these gates and hurts their fidelity by hampering sympathetic cooling. We study the general mass dependence of mutual mode participation in interspecies chains and the laser power required to drive entangling gates with amplitude modulation and amplitude-frequency modulation. We find that co-trapping different isotopes of the same element may be most desirable.

*This work is supported by the ARO with funding from the IARPA LogiQ program, the AFOSR, the ARO MURI on Modular Quantum Circuits, the AFOSR MURI on Quantum Transduction, the AFOSR MURI on Interactive Quantum Computation and Communication Protocols, and the ARL Center for Distributed Quantum Information.

Presenters

  • Jameson O'Reilly

    • Joint Quantum Institute, University of Maryland, College Park
    • JQI, University of Maryland, College Park

Authors

  • Jameson O'Reilly

    • Joint Quantum Institute, University of Maryland, College Park
    • JQI, University of Maryland, College Park

  • Allison L Carter

    • Joint Quantum Institute, University of Maryland, College Park
    • JQI, University of Maryland, College Park

  • Ksenia Sosnova

    • JQI, University of Maryland, College Park

  • Sagnik Saha

    • Joint Quantum Institute, University of Maryland, College Park
    • JQI, University of Maryland, College Park

  • Yao De George Toh

    • Joint Quantum Institute, University of Maryland, College Park
    • JQI, University of Maryland

  • Christopher R Monroe

    • JQI and QuiCS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham, NC
    • JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 2
    • University of Maryland, College Park
    • Joint Quantum Institute, University of Maryland, College Park
    • Joint Quantum Institute and Joint Center for Quantum Information and Computer Science, University of Maryland and NIST, College Park, MD 20742 USA
    • JQI, University of Maryland, College Park
    • JQI and QuICS and Department of Physics, University of Maryland, College Park, MD 20742; Duke Quantum Center and Department of Physics (and ECE), Duke University, Durham NC 27
    • Joint Quantum Institute, Joint Center for Quantum Information and Computer Science, and Physics Department, University of Maryland, College Park and National Institute of Sta