Cross-species gates in a Ba/Yb ion trap for modular networked quantum computing

ORAL

Abstract

A modular network of many ion traps is a promising approach to building a scalable quantum computer. Generation of entanglement between remote atomic qubits has been demonstrated using interference of simultaneously emitted photons from one qubit in each trap. However, stray photons emitted during this process may corrupt information stored in nearby qubits. To avoid this problem we have implemented co-trapping of two different elements in the same ion trap. $^{171}$Yb$^+$ is used as a quantum memory and processor, while $^{138}$Ba$^+$ is used for communication. The 493 nm photons from Ba$^+$ do not couple to the Yb$^+$ system, and suffer less attenuation in fiber optics than wavelengths available from most commonly trapped ion species. In this talk we report demonstration of state mapping between the Yb$^+$ and Ba$^+$ internal qubits, and progress towards utilizing these techniques in entanglement of remote qubits.

*This work is supported by the ARO with funding from the IARPA MQCO program, the DARPA Quiness program, the AFOSR MURI on Quantum Transduction, and the ARL Center for Distributed Quantum Information.

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Authors

  • Martin Lichtman

    • Joint Quantum Institute, University of Maryland-College Park
    • Joint Quantum Institute, University of Maryland
    • Joint Quantum Institute and University of Maryland Department of Physics, College Park, Maryland 20742

  • Ismail Inlek

    • Joint Quantum Institute and University of Maryland Department of Physics, College Park, Maryland 20742

  • Clay Crocker

    • Joint Quantum Institute and University of Maryland Department of Physics, College Park, Maryland 20742

  • Ksenia Sosnova

    • Joint Quantum Institute and University of Maryland Department of Physics, College Park, Maryland 20742

  • Chris Monroe

    • Joint Quantum Institute and University of Maryland Department of Physics, College Park, Maryland 20742
    • Joint Quantum Institute, University of Maryland Department of Physics and National Institute of Standards and Technology, College Park, Maryland 2074