Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-08-21
Nature 442, 766-771 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Total 25 pages. 11 pages main text, 5 figures, 9 pages supplementary material
Scientific paper
10.1038/nature05065
The ability to control the quantum state of a single electron spin in a quantum dot is at the heart of recent developments towards a scalable spin-based quantum computer. In combination with the recently demonstrated exchange gate between two neighbouring spins, driven coherent single spin rotations would permit universal quantum operations. Here, we report the experimental realization of single electron spin rotations in a double quantum dot. First, we apply a continuous-wave oscillating magnetic field, generated on-chip, and observe electron spin resonance in spin-dependent transport measurements through the two dots. Next, we coherently control the quantum state of the electron spin by applying short bursts of the oscillating magnetic field and observe about eight oscillations of the spin state (so-called Rabi oscillations) during a microsecond burst. These results demonstrate the feasibility of operating single-electron spins in a quantum dot as quantum bits.
Buizert Christo
Koppens Frank H. L.
Kouwenhoven Leo P.
Meunier Tristan
Nowack Katja C.
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