A few-electron triple quantum dot incorporating two fast charge sensors

ORAL

Abstract

A triple quantum dot is defined in a GaAs heterostructure. The occupation of all three dots is monitored using two nearby charge sensing point contacts. Radio frequency multiplexing in a reflectometry setup allows MHz-bandwidth measurements of both charge sensors independently. Configuring the device in the few-electron regime, we achieve coherent spin manipulation using the exchange interaction.

*We acknowledge support from ARO/iARPA, Department of Defense, and Harvard Center for Nanoscale Systems.

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Authors

  • Edward Laird

    • Department of Physics, Harvard University

  • Charles Marcus

    • Department of Physics, Harvard University

  • Micah Hanson

    • Materials Department, University of California at Santa Barbara

  • Art Gossard

    • Materials Department, University of California at Santa Barbara