Adiabatic two-qubit gates of capacitively coupled quantum dot hybrid qubits

ORAL

Abstract

Semiconductor quantum dot qubits have progressed greatly over the past several years, with two-qubit gates realized by several groups. So far, the fidelities reported for these gates are still below the error correction threshold. Here, we model a system consisting of two capacitively-coupled quantum dot hybrid qubits, and optimize the adiabatic electrical pulses used to entangle these qubits. We find a simple pulse that yields a CZ gate with greater than 99% fidelity in the presence of a quasistatic charge noise distribution with standard deviation 1 µeV. Further, we introduce the concept of a “dynamical sweet spot” which can be used to develop pulses that decrease the infidelity by a factor of >5.

*Support by ARO (W911NF-12- 1-0607, W911NF-17-1-0274), and NSF (PHY-1104660) is acknowledged. The views and conclusions reported here are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of ARO or the U.S. Government. The authors acknowledge support from the Vannevar Bush Faculty Fellowship program,funded by the Office of Naval Research through Grant No. N00014-15-1-0029.

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Presenters

  • Adam Frees

    • University of Wisconsin - Madison

Authors

  • Adam Frees

    • University of Wisconsin - Madison

  • John Gamble

    • Quantum Architecture and Computation Group, Microsoft Research, Redmond, Washington 98052, USA
    • Quantum Architectures and Computation Group, Microsoft Research

  • Mark G Friesen

    • Department of Physics, University of Wisconsin-Madison
    • University of Wisconsin-Madison
    • University of Wisconsin - Madison

  • Susan Coppersmith

    • Department of Physics, University of Wisconsin-Madison
    • University of Wisconsin-Madison
    • University of Wisconsin - Madison