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We thank O. N. Jouravlev and Y. Nazarov for developing a model that helped greatly with the physical interpretation of the data; G. Burkard, W. A. Coish, V. N. Golovach, A. C. Johnson, D. Loss, and C. M. Marcus for fruitful discussions; R. Schouten, B. van den Enden, and M. van Oossanen for technical assistance; and J. Caro for supporting infrastructure. Supported by the Defense Advanced Research Projects Agency Quantum Information Science and Technology program, the Dutch Organization for Fundamental Research on Matter (FOM), the Netherlands Organization for Scientific Research (NWO), the Office of Naval Research, Exploratory Research for Advanced Technology, and the EU Research Training Network on spintronics.
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