Remote entanglement of <sup>138</sup>Ba<sup>+</sup> ions in separate traps using visible photons

ORAL

Abstract

Trapped atomic ions are one of the leading platforms for quantum computing systems and quantum networks. We report progress on one building block of a trapped-ion quantum network, the remote entanglement of ions in two separate vacuum chambers. Single photons at 493 nm are collected from a 138Ba+ ion in each trap using high numerical aperture (NA=0.6) optics, and Hong-Ou-Mandel interference erases which-path information. Then, a Bell state measurement of the photons heralds entanglement of the two remote qubits. We verify this entanglement by measuring the correlations of the ion states in multiple bases. We present preliminary results for entanglement generation rate and fidelity and also speculate on how this system will scale to larger and more modules.

*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

  • Yao De George Toh

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

Authors

  • Yao De George Toh

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

  • Allison L Carter

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

  • Jameson O'Reilly

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

  • Sagnik Saha

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

  • Andrew Risinger

    • JQI and QuICS and Departments of ECE and Physics, University of Maryland, College Park, MD 20742
    • Joint Quantum Institute, University of Maryland, College Park
    • University of Maryland, College Park
    • JQI and QuICS and Departments of Physics and ECE, University of Maryland, College Park, MD 20742

  • 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