Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Coherent manipulation of coupled electron spins in semiconductor quantum dots
AU - Petta, null
AU - Johnson, AC
AU - Taylor, JM
AU - Laird, E. A.
AU - Yacoby, A
AU - Lukin, MD
AU - Marcus, CM
AU - Hanson, MP
AU - Gossard, AC
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, 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.
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, 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.
KW - COMPUTATION
KW - BLOCKADE
KW - COULOMB
KW - SYSTEM
U2 - 10.1126/science.1116955
DO - 10.1126/science.1116955
M3 - Journal article
VL - 309
SP - 2180
EP - 2184
JO - Science
JF - Science
SN - 0036-8075
IS - 5744
ER -