Journal
SCIENCE
Volume 333, Issue 6047, Pages 1269-1272Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1209524
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Funding
- Army Research Office
- Dutch Foundation for Fundamental Research on Matter
- European Research Council (ERC)
- European Commission (SOLID)
- Swiss National Science Foundation
- Le Fonds Quebecois de la Recherche sur la Nature et les Technologies
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Measurement of coupled quantum systems plays a central role in quantum information processing. We have realized independent single-shot read-out of two electron spins in a double quantum dot. The read-out method is all-electrical, cross-talk between the two measurements is negligible, and read-out fidelities are similar to 86% on average. This allows us to directly probe the anticorrelations between two spins prepared in a singlet state and to demonstrate the operation of the two-qubit exchange gate on a complete set of basis states. The results provide a possible route to the realization and efficient characterization of multiqubit quantum circuits based on single quantum dot spins.
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