Fast coherent manipulation of three-electron states in a double quantum dot

Zhan Shi, C. B. Simmons, Daniel R. Ward, J. R. Prance, Xian Wu, Teck Seng Koh, John King Gamble, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith and M. A. Eriksson ()
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Zhan Shi: University of Wisconsin-Madison
C. B. Simmons: University of Wisconsin-Madison
Daniel R. Ward: University of Wisconsin-Madison
J. R. Prance: University of Wisconsin-Madison
Xian Wu: University of Wisconsin-Madison
Teck Seng Koh: University of Wisconsin-Madison
John King Gamble: University of Wisconsin-Madison
D. E. Savage: University of Wisconsin-Madison
M. G. Lagally: University of Wisconsin-Madison
Mark Friesen: University of Wisconsin-Madison
S. N. Coppersmith: University of Wisconsin-Madison
M. A. Eriksson: University of Wisconsin-Madison

Nature Communications, 2014, vol. 5, issue 1, 1-5

Abstract: Abstract An important goal in the manipulation of quantum systems is the achievement of many coherent oscillations within the characteristic dephasing time T2*. Most manipulations of electron spins in quantum dots have focused on the construction and control of two-state quantum systems, or qubits, in which each quantum dot is occupied by a single electron. Here we perform quantum manipulations on a system with three electrons per double quantum dot. We demonstrate that tailored pulse sequences can be used to induce coherent rotations between three-electron quantum states. Certain pulse sequences yield coherent oscillations fast enough that more than 100 oscillations are visible within a T2* time. The minimum oscillation frequency we observe is faster than 5 GHz. The presence of the third electron enables very fast rotations to all possible states, in contrast to the case when only two electrons are used, in which some rotations are slow.

Date: 2014
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DOI: 10.1038/ncomms4020

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