Two-qubit gates in silicon quantum dots

ORAL

Abstract

Silicon spin qubits offer long coherence times and exquisite single-qubit control in a platform that has proven to be scalable by the semiconductor electronics industry. Despite these advantages, there are very few demonstrations of two-qubit gates [1-3]. By incorporating a micromagnet with a double quantum dot device, we have recently demonstrated a fast (<200 ns), resonantly-driven CNOT gate [2]. In the same device, we have also implemented a CPHASE gate by applying dc voltage pulses to the barrier gate separating the two qubits. In this talk, we will discuss the operation of the CPHASE and address complications due to the field gradient generated by the micromagnet. We compare the CPHASE operation to the resonantly-driven CNOT and estimate the corresponding two-qubit gate fidelities.

[1] M. Veldhorst et al., Nature 526, 410 (2015).
[2] D. M. Zajac et al., arXiv:1708.03530 (2017).
[3] T. F. Watson et al., arXiv:1708.04214 (2017).

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Presenters

  • Anthony Sigillito

    Physics, Princeton University, Princeton Univ, Physics, Princeton Univ.

Authors

  • Anthony Sigillito

    Physics, Princeton University, Princeton Univ, Physics, Princeton Univ.

  • David Zajac

    Physics, Princeton University, Physics, Princeton Univ., Department of Physics, Princeton University

  • Maximilian Russ

    Physics, University of Konstanz, Physics, Univ. Konstanz

  • Jacob Taylor

    Joint Quantum Institute and Joint Center for Quantum information Processing and Computer Science, NIST and University of Maryland, Joint Quantum Institute/NIST, National Institute of Standards and Technology, JQI/NIST, JQI, NIST & Univ. Maryland, Joint Center for Quantum Information and Computer Science, University of Maryland, Joint Quantum Institute

  • Guido Burkard

    University of Konstanz, Physics, University of Konstanz, Department of Physics, University of Konstanz, Univ Konstanz, Uni Konstanz, Physics, Univ. Konstanz, Physics, Univ Konstanz

  • Jason Petta

    Physics, Princeton University, Princeton University, Department of Physics, Princeton University, Physics, Princeton Univ.