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"Coherent manipulation of coupled
electron spins in semiconductor quantum
dots," by J.R. Petta and 8
others, Science, 309(5744): 2180-4, 30 September 2005.
[Authors' affiliations: Harvard University,
Cambridge, MA; Weizmann Institute of Science, Rehovot, Israel; University of
California, Santa Barbara]
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."
This 2005 report from Science was
cited 30 times in current journal articles indexed by Thomson
Scientific during July-August 2006. No other physics paper published in the
last two years, excluding reviews, attracted a higher number of citations
during that two-month period. Prior to the most recent bimonthly count,
citations to the paper have accrued as follows:
May-June 2006: 15 citations
March-April 2006: 11
January-February 2006: 7
November-December 2005: 2
September-October 2005: 1
Total citations to date: 66
SOURCE: Hot
Papers Database (Included with a subscription to the print newsletter Science
Watch®, available from the
Research Services Group. Packaged on a CD that is mailed with each Science
Watch issue, the Hot
Papers Database contains data on hundreds of highly cited papers published
during the last two years. User interface permits searching by author,
organization, journal, field, and more. Total citations, as well as citations
accrued during successive bimonthly periods, can be assessed and graphed. An
updated CD containing the most recent bimonthly data is mailed with every new
issue of Science
Watch,
six times a year. The CD also includes an electronic version of the Science
Watch
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