Pulse-gated quantum dot hybrid qubit

ORAL

Abstract

A quantum dot hybrid qubit formed from three electrons in a double quantum dot has the potential for great speed, due to presence of level crossings where the qubit becomes charge-like. Here, we show how to exploit the level crossings to implement fast pulsed gating. We develop one- and two-qubit dc quantum gates that are simpler than the previously proposed ac gates [1]. We obtain closed-form solutions for the control sequences and show that the gates are fast (sub-nanosecond) and can achieve high fidelities. \\[4pt] [1] Z. Shi, et al., Phys. Rev. Lett. 108, 140503 (2012).

*Work supported by ARO (W911NF-08-1-0482) and NSF (DMR-0805045, PHY-1104660), and the National Science Foundation Graduate Research Fellowship (DGE-0718123).

–

Authors

  • Susan N. Coppersmith

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

  • Teck Seng Koh

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

  • John King Gamble

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

  • Mark Eriksson

    • Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706
    • University of Wisconsin-Madison
    • University of Wisconsin - Madison
    • Department of Physics, University of Wisconsin-Madison

  • Mark Friesen

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