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arXiv:1106.3518 · Nature Physics

Coherent control of three-spin states in a triple quantum dot

Louis Gaudreau, Ghislain Granger, A. Kam, G. C. Aers, Sergei Studenikin, P. Zawadzki, Michel Pioro-Ladrière, Z. R. Wasilewski, Andy S. Sachrajda

Published Nov 27, 2011• 251 citations
arXivHTMLPDF
DOI
10.1038/nphys2149

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The triple quantum dot energy level spectrum is far more complex than its double quantum dot counterpart. As a result it is a challenge to cleanly manipulate only the two required qubit states without invoking more complex multistate coherent evolution. In this talk I will describe experiments and modeling of lateral triple quantum dot devices where by suitable device gate (i.e. energy level spectrum) tuning and pulse characteristics we were able to characterize and manipulate various three spin qubit species. In particular I will describe measurements where the Landau-Zener –Stuckelberg approach previously demonstrated in double dots is extended to threeinteracting spin states permitting us to demonstrate phenomena such as pairwise exchange control. I will also demonstrate how by tuning the experimental parameters one can controllably switch to coherent oscillations originating from alternative potentially useful qubit states and how to distinguish them.