Single-shot correlations and two-qubit gate of solid-state spins |
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Authors: | Nowack K C Shafiei M Laforest M Prawiroatmodjo G E D K Schreiber L R Reichl C Wegscheider W Vandersypen L M K |
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Institution: | Kavli Institute of Nanoscience, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands. k.c.nowack@tudelft.nl |
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Abstract: | 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 ~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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