A many-body coupler for coherent 4-local interaction of superconducting flux qubits

ORAL

Abstract

Interactions of more than two bodies simultaneously rarely appear in nature. Even in dense systems, forces usually act pairwise. However, n-local terms with n>3 frequently arise when mapping physical or mathematical problems to an Ising spin Hamiltonian. Superconducting flux qubits have emerged as a promising, versatile platform to simulate such spin systems and find their ground state, but the implementation of n-local superconducting qubit couplers has so far proven elusive. Here we present a circuit that enables large 4-local interaction between four flux qubits without spurious 2-local terms and without relying on an effective low-energy description as in Hamiltonian gadgets. We demonstrate numerically how 4-local coupling of up to several hundred MHz arises from a coupler circuit with tailored spectral properties. These properties are engineered by combining known superconducting circuit physics with suggestions by an inverse design algorithm that we have developed previously. In addition, we show first experimental results probing a fabricated coupler prototype.

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Presenters

  • Tim Menke

    Department of Physics, Harvard University; Department of Physics, MIT; Research Laboratory of Electronics, MIT

Authors

  • Tim Menke

    Department of Physics, Harvard University; Department of Physics, MIT; Research Laboratory of Electronics, MIT

  • Cyrus F. Hirjibehedin

    MIT Lincoln Laboratory, London Centre for Nanotechnology, University College London

  • Steven J. Weber

    MIT Lincoln Laboratory

  • Gabriel O. Samach

    Lincoln Lab, Massachusetts Institute of Technology, USA, MIT Lincoln Laboratory, Department of Electrical Engineering and Computer Science, MIT; MIT Lincoln Laboratory

  • Simon Gustavsson

    Research Laboratory of Electronics, Massachusetts Institute of Technology, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology, USA, Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, Research Laboratory of Electronics, MIT

  • Alan Aspuru-Guzik

    Zapata Computing, Chemistry and Computer Science, University of Toronto, University of Toronto, Department of Chemistry, and Computer Science, Department of Chemistry and Department of Computer Science, University of Toronto; Vector Institute for Artificial Intelligence, Toronto; Canadian Institute for Advanced Rese, University of Toronto

  • William D Oliver

    Research Laboratory of Electronics, Massachusetts Institute of Technology, Department of Physics, Research Laboratory of Electronics, Lincoln Laboratory, Massachusetts Institute of Technology, MIT Lincoln Lab, MIT Lincoln Laboratory, Department of Physics, Massachusetts Institute of Technology, MIT Lincoln Laboratory, Massachusetts Institute of Technology, Research Laboratory of Electronics, Physics, Lincoln Laboratory, Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology, MIT Lincoln Laboratory, Physics, Massachusetts Institute of Technology, Dept. of Physics, Research Laboratory of Electronics, and Lincoln Lab, Massachusetts Institute of Technology, USA, Research Laboratory of Electronics, Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, MIT Lincoln Laboratory, 244 Wood Street, Lexington, MA, Massachusetts Institute of Technology and MIT Lincoln Laboratory, Research Laboratory of Electronics, MIT Lincoln Laboratory, Department of Physics, Massachusetts Institute of Technology, Department of Physics, Research Laboratory of Electronics, MIT Lincoln Laboratory, Massachusetts Institute of Technology, Department of Physics, MIT; Research Laboratory of Electronics, MIT; MIT Lincoln Laboratory

  • Andrew James Kerman

    MIT Lincoln Laboratory, Massachusetts Institute of Technology