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

doi:10.1126/science.1116955

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

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2754 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 language	English (US)
Pages (from-to)	2180-2184
Number of pages	5
Journal	Science
Volume	309
Issue number	5744
DOIs	https://doi.org/10.1126/science.1116955
State	Published - Sep 30 2005

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title = "Applied physics: Coherent manipulation of coupled electron spins in semiconductor quantum dots",

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.",

author = "Petta, {J. R.} and Johnson, {A. C.} and Taylor, {J. M.} and Laird, {E. A.} and A. Yacoby and Lukin, {M. D.} and Marcus, {C. M.} and Hanson, {M. P.} and Gossard, {A. C.}",

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T1 - Applied physics

T2 - Coherent manipulation of coupled electron spins in semiconductor quantum dots

AU - Petta, J. R.

AU - Johnson, A. C.

AU - Taylor, J. M.

AU - Laird, E. A.

AU - Yacoby, A.

AU - Lukin, M. D.

AU - Marcus, C. M.

AU - Hanson, M. P.

AU - Gossard, A. C.

PY - 2005/9/30

Y1 - 2005/9/30

N2 - 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.

AB - 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.

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JO - Science

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

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