Adiabatic Quantum State Transfer in an Array of Spins

ORAL

Abstract

Any scalable quantum processor with many qubits requires interqubit connectivity for the efficient execution of useful quantum algorithms. In recent years, there has been significant progress in both theoretical and experimental efforts aimed at improving connectivity in spin-qubits, which are usually defined in one- or two-dimensional arrays. Here we demonstrate evidence of adiabatic quantum-state transfer (AQT) of single-spin eigenstates and two-spin entangled states in a chain of four spins in gate defined quantum-dots in a GaAs/AlGaAs heterostructure. We transfer spin states from one side of the array to the other side in tens of nanoseconds with simulated transfer probabilities exceeding 90% via adiabatic modulation of the nearest-neighbor exchange couplings between spins. We also demonstrate that this method is scalable for longer arrays of spin-qubits. AQT is robust to noise and pulse-timing errors and it will be useful for initialization, state distribution, and readout in large spin-qubit arrays.

*This work was sponsored by the Defense Advanced Research Projects Agency under Grant No. D18AC00025, the Army Research Office under Grant Nos. W911NF-16-1-0260 and W911NF-19-1-0167, and the National Science Foundation under Grant Nos. DMR-1941673 and DMR-2003287.

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Presenters

  • Yadav Kandel

    • University of Rochester

Authors

  • Yadav Kandel

    • University of Rochester

  • Haifeng Qiao

    • University of Rochester

  • Saeed Fallahi

    • Purdue University
    • Purdue Univ

  • Geoffrey C. Gardner

    • Purdue University
    • Purdue Univ
    • Microsoft Quantum at Station Q Purdue, Purdue University
    • Purdue University, Microsoft Station Q, West Lafayette, Indiana 47907, USA
    • Microsoft Quantum at station Q Purdue
    • Microsoft Station Q Purdue, Purdue University
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University

  • Michael Manfra

    • Purdue University
    • Purdue Univ
    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Niels Bohr Institute, Microsoft Station Q, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Department of Physics and Astronomy, Purdue University
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University

  • John Nichol

    • University of Rochester