Construction of An Ion Trap with High-NA In-Vacuum Objectives for a Modular Quantum Computer

ORAL

Abstract

One architecture for scaling trapped ion quantum computers consists of multiple reasonably-sized nodes connected with photonic links that entangle remote ions. Each node contains both memory qubits for storing information and communication qubits for generating photons. To date, demonstrations of this architecture have been limited by slow entanglement between nodes due to photon loss. We have built an ion trap system with two aspheric lenses inside the vacuum chamber with a numerical aperture of 0.8 and a working distance from the ion of 6 mm. The lenses collect 40% of the light emitted from a 138Ba+ ion, a large increase over the previously reported 10%, and may reduce fiber coupling sensitivity to vacuum window deformations. We discuss the design and testing of the light collection capabilities of this system and consider its incorporation in a quantum computer consisting of three separate 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.

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Presenters

  • Allison L Carter

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

Authors

  • 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

  • Yao De George Toh

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

  • Sagnik Saha

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

  • 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