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Coherent manipulation of coupled electron spins in semiconductor quantum dots

Research output: Contribution to journalJournal article

Published
  • Petta
  • AC Johnson
  • JM Taylor
  • E. A. Laird
  • A Yacoby
  • MD Lukin
  • CM Marcus
  • MP Hanson
  • AC Gossard
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<mark>Journal publication date</mark>30/09/2005
<mark>Journal</mark>Science
Issue number5744
Volume309
Number of pages5
Pages (from-to)2180-2184
Publication StatusPublished
<mark>Original language</mark>English

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, T(2)*, of similar to 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.