Fabrication and measurement of an RF-QPC in an undoped Si/SiGe heterostructure

ORAL

Abstract

We perform radio-frequency reflectometry measurements on a quantum point contact fabricated in an undoped accumulation-mode Si/SiGe heterostructure. This device is a promising candidate for high-bandwidth charge sensing in Si/SiGe, and it provides the capability for fast qubit readout in this material. We show operation of the device with a well-defined resonance that can be modulated by a nearby gate. We will discuss design challenges that are particular to accumulation-mode structures and how they can be resolved.

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Authors

  • Robert Mohr

    University of Wisconsin - Madison

  • Daniel Enderich

    University of Wisconsin - Madison

  • Jonathan Prance

    University of Wisconsin - Madison

  • Leon Maurer

    University of Wisconsin-Madison, University of Wisconsin - Madison

  • Daniel Ward

    University of Wisconsin-Madison, University of Wisconsin - Madison

  • Donald Savage

    University of Wisconsin - Madison

  • Max Lagally

    University of Wisconsin - Madison, University of Wisconsin-Madison

  • Robert McDermott

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

  • Susan N. Coppersmith

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

  • 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