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Published Online September 1, 2005
Science DOI: 10.1126/science.1116955

Research Articles

Submitted on July 5, 2005
Accepted on August 22, 2005

Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots

Jason R. Petta 1, Alexander C. Johnson 1, Jacob M. Taylor 1, Edward A. Laird 1, Amir Yacoby 2, Mikhail D. Lukin 1, Charles M. Marcus 1*, Micah P. Hanson 3, Arthur C. Gossard 4

1 Department of Physics, Harvard University, Cambridge, MA 02138, USA.
2 Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100 Israel.
3 Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106, USA.
4 Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106, USA.

* To whom correspondence should be addressed.
Charles M. Marcus , E-mail: marcus{at}physics.harvard.edu

We demonstrate 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 read-out. These techniques are based on rapid electrical control of the exchange interaction. Separating and later recombining a singlet spin state provides a measurement of the spin dephasing time, T2* ~ 10 ns, limited by hyperfine interactions with the GaAs host nuclei. Rabi oscillations of two-electron spin states are demonstrated, and spin-echo pulse sequences are used to suppress hyperfine-induced dephasing. Using these quantum control techniques, a coherence time for two-electron spin states exceeding 1 µs is observed.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)