Applied physics: Coherent manipulation of coupled electron spins in semiconductor quantum dots

J. R. Petta, A. C. Johnson, J. M. Taylor, E. A. Laird, A. Yacoby, M. D. Lukin, C. M. Marcus, M. P. Hanson, A. C. Gossard

Research output: Contribution to journalArticle

2268 Scopus citations

Abstract

We demonstrated coherent control of a quantum two-level system based on two-electron spin states in a double quantum dot, allowing state preparation, coherent manipulation, and projective readout. These techniques are based on rapid electrical control of the exchange interaction. Separating and later recombining a singlet spin state provided a measurement of the spin dephasing time, T2*, of ∼10 nanoseconds, limited by hyperfine interactions with the gallium arsenide host nuclei. Rabi oscillations of two-electron spin states were demonstrated, and spin-echo pulse sequences were used to suppress hyperfine-induced dephasing. Using these quantum control techniques, a coherence time for two-electron spin states exceeding 1 microsecond was observed.

Original languageEnglish (US)
Pages (from-to)2180-2184
Number of pages5
JournalScience
Volume309
Issue number5744
DOIs
StatePublished - Sep 30 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

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    Petta, J. R., Johnson, A. C., Taylor, J. M., Laird, E. A., Yacoby, A., Lukin, M. D., Marcus, C. M., Hanson, M. P., & Gossard, A. C. (2005). Applied physics: Coherent manipulation of coupled electron spins in semiconductor quantum dots. Science, 309(5744), 2180-2184. https://doi.org/10.1126/science.1116955