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High fidelity encoded gate operations for composite superconducting qubit

ORAL

Abstract

Our encoded qubit scheme for superconducting transmon qubits explores a non-traditional architecture where the computational states are encoded by the hybridized states formed by a pair of capacitively coupled degenerate transmons. Gate operations can be implemented on the encoded qubit using non-adiabatic Landau-Zener control at the small avoided crossing and requiring only baseband control, without individual microwave control for each transmon. Even with frequencies far below the effective temperature, high fidelity encoded gates can be achieved utilizing the sweet spot (optimal operating point) and dynamical sweet spot (optimal pulse shape). Further, these composite qubits show immunity to photon noise in readout resonators, which can be a limiting factor in many transmon-based quantum computing systems, often requiring special attenuators to mitigate. We also discuss the leakage errors due to relaxation to the physical ground state which is outside of the encoded qubit's computational subspace.

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Presenters

  • Yun-Pil Shim

    Laboratory for Physical Sciences

Authors

  • Yun-Pil Shim

    Laboratory for Physical Sciences

  • Daniel L Campbell

    Research Laboratory of Electronics, Massachusetts Institute of Technology

  • Bharath Kannan

    Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology (MIT)

  • Roni Winik

    Research Laboratory of Electronics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology

  • Alexander Melville

    MIT Lincoln Laboratory, MIT Lincoln Lab, MIT Lincoln Laboratories, Massachusetts Institute of Technology (MIT) Lincoln Laboratory

  • Bethany Niedzielski

    MIT Lincoln Laboratory

  • Jonilyn Yoder

    MIT Lincoln Laboratory, MIT Lincoln Lab, Massachusetts Institute of Technology (MIT) Lincoln Laboratory

  • Terry Philip Orlando

    Electrical Engineering and Computer Science, Research Laboratory of Electronics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MIT, Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology, Massachusetts Institute of Technology, MIT Lincoln Laboratory, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology (MIT)

  • Simon Gustavsson

    Research Laboratory of Electronics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology (MIT)

  • William Oliver

    Research Laboratory of Electronics, Department of Electrical Engineering and Computer Science, Department of Physics, MIT Lincoln Laboratory, Massachusetts Institute of Techn, MIT Lincoln Lab, MIT Lincoln Laboratory, MIT Lincoln Laboratory, Massachusetts Institute of Technology, Department of Physics, Department of Electrical Engineering and Computer Science, Research Laboratory of Electronics, Lincoln Laboratory, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology MIT, Department of Electrical Engineering and Computer Science, Department of Physics, Massachusetts Institute of Technology; MIT Lincoln Laboratory, Department of Electrical Engineering and Computer Science, Department of Physics, MIT Lincoln Laboratory, Massachusetts Institute of Technology, Massachusetts Institute of Technology, Research Laboratory of Electronics, Massachusetts Institute of Technology, Research Laboratory of Electronics, Department of Electrical Engineering & Computer Science, Department of Physics, Massachusetts Institute of Technology and MIT Lincoln Labo, Physics, MIT, MIT-Lincoln Lab, MIT Lincoln Laboratories, Research Laboratory of Electronics, Department of Physics, Department of Electrical Engineering and Computer Science, Lincoln Laboratory, Massachusetts Institute of Technolog

  • Charles Tahan

    Laboratory for Physical Sciences, Laboratory for Physical Sciences, College Park, MD 20740, U.S.A.