Probing resonating valence bonds on a programmable germanium quantum simulator

ORAL

Abstract

Simulations using highly tunable quantum systems may enable investigations of condensed matter systems beyond the capabilities of classical computers. Quantum dots and donors in semiconductor technology define a natural approach to implement quantum simulation. Several material platforms have been used to study interacting charge states, while gallium arsenide has also been used to investigate spin evolution. However, decoherence remains a key challenge in simulating coherent quantum dynamics. Here, we introduce quantum simulation using hole spins in germanium quantum dots. We demonstrate extensive and coherent control enabling the tuning of multi-spin states in isolated, paired, and fully coupled quantum dots. We then focus on the simulation of resonating valence bonds and measure the evolution between singlet product states which remains coherent over many periods. Finally, we realize four-spin states with s-wave and d-wave symmetry. These results provide means to perform non-trivial and coherent simulations of correlated electron systems.

*We acknowledge support through an ERC Starting Grant and through an NWO projectruimte. Research was sponsored by the Army Research Office (ARO) and was accomplished under Grant No. W911NF-17-1-0274.

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Presenters

  • Chien-An Wang

    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

Authors

  • Chien-An Wang

    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

  • Corentin Déprez

    • Delft University of Technology

  • Hanifa Tidjani

    • Delft University of Technology

  • William Iain L Lawrie

    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

  • Nico Hendrickx

    • IBM Research
    • IBM Research Europe - Zurich
    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

  • Amir Sammak

    • TNO, Qutech
    • QuTech and TNO, Stieltjesweg 1, 2628 CK Delft, The Netherlands
    • Netherlands Organisation for Applied Scientific Research (TNO)
    • QuTech and Netherlands Organization for Applied Scientific Research (TNO), Delft, The Netherlands
    • TNO, QuTech
    • TNO
    • Netherlands Organization for Applied Scientific Research (TNO)
    • QuTech and Netherlands Organisation for Applied Scientific Research (TNO), Stieltjesweg 1, 2628 CK Delft, The Netherlands
    • TNO/QuTech

  • Giordano Scappucci

    • QuTech and Kavli Institute of Nanoscience, TU Delft, P.O. Box 5046, 2600 GA Delft, The Netherlands
    • Delft University of Technology
    • QuTech and the Kavli Institute of Nanoscience, Delft University of Technology
    • TU Delft QuTech
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands

  • Menno Veldhorst

    • Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands