Coherent manipulation of coupled electron spins in semiconductor quantum dots

Petta, and Johnson, AC and Taylor, JM and Laird, E. A. and Yacoby, A and Lukin, MD and Marcus, CM and Hanson, MP and Gossard, AC (2005) Coherent manipulation of coupled electron spins in semiconductor quantum dots. Science, 309 (5744). pp. 2180-2184. ISSN 0036-8075

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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.

Item Type:
Journal Article
Journal or Publication Title:
Science
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1000
Subjects:
ID Code:
124369
Deposited By:
Deposited On:
04 Apr 2018 10:30
Refereed?:
Yes
Published?:
Published
Last Modified:
25 Sep 2020 03:37