High-fidelity conditional two-qubit swapping gate using tunable ancillas

ORAL

Abstract

Scalable quantum computing relies crucially on high-fidelity entangling operations. Here we demonstrate that four coupled qubits can operate as a high-fidelity two-qubit entangling gate that swaps two target qubits and adds a relative sign on the |11〉 state (ZSWAP). The gate operation is controlled by the state of two ancilla (control) qubits. The system is readily implementable with superconducting qubits, using capacitively coupled qubits arranged in a diamond-shaped architecture. By using realistic device and noise parameters from state-of-the-art superconducting qubits, we show that the conditional ZSWAP operation can be implemented with a fidelity above 0.99 in a time of about 65 ns.

–

Presenters

  • Niels Jakob Loft

    Aarhus University, Department of Physics and Astronomy, Aarhus University

Authors

  • Niels Jakob Loft

    Aarhus University, Department of Physics and Astronomy, Aarhus University

  • Morten Kjærgaard

    Research Laboratory of Electronics, Massachusetts Institute of Technology, Massachusetts Institute of Technology, Niels Bohr Institute, Research Laboratory of Electronics, Massachusetts Institute of Technology, USA

  • Lasse Bjørn Kristensen

    Aarhus University, Department of Physics and Astronomy, Aarhus University, Department of Physics and Astronomy, Aahus University

  • Christian Kraglund Andersen

    ETH Zurich, ETH Zürich, Department of Physics, ETH Zurich

  • Thorvald W Larsen

    Niels Bohr Insitute, Univ of Copenhagen, Niels Bohr Institute, Center for Quantum Devices and Microsoft Quantum Lab–Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark

  • 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

  • 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

  • Nikolaj T Zinner

    Aarhus University, Department of Physics and Astronomy, Aarhus University, Department of Physics and Astronomy, Aahus University