Optimized pulse shaping for trapped ion quantum computing

ORAL

Abstract

We perform entangling phase gates between pairs of qubits in a chain of trapped atomic ytterbium ions. Beat notes between frequency comb lines of a pulsed laser coherently drive Raman transitions that couple the hyperfine qubits to multiple collective transverse modes of motion [1]. By optimizing the phase and amplitude of segmented laser pulses, we demonstrate a five-segment scheme [2] to entangle two qubits with high fidelity over a range of detunings. We compare this special case of full control of spin-motion entanglement to a traditional single-segment gate. We extend this scheme to selectively entangle pairs of qubits in larger chains using individual optical addressing, where we couple to all the motional modes. We show how these robust gates can achieve high fidelities for practical gate times in an approach that scales realistically to much larger numbers of qubits.\\[4pt] [1] D. Hayes et al., Phys. Rev. Lett 104, 140501 (2010).\\[0pt] [2] S.-L. Zhu et al., Europhys. Lett., 73 (4), pp. 485-491 (2006)

*This work is supported by grants from the U.S. Army Research Office with funding from the DARPA OLE program, IARPA, and the MURI program; and the NSF Physics Frontier Center at JQI.

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Authors

  • T. Andrew Manning

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

  • Shantanu Debnath

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

  • Taeyoung Choi

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

  • Caroline Figgatt

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

  • Chris Monroe

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