Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-10-07
Phys. Rev. B 73, 205302 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
v1:9 pages, 1 figure; v2: 13 pages, 2 figures, added section on measurement, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.73.205302
We study spin dynamics for two electrons confined to a double quantum dot under the influence of an oscillating exchange interaction. This leads to driven Rabi oscillations between the $\ket{\uparrow\downarrow}$--state and the $\ket{\downarrow\uparrow}$--state of the two--electron system. The width of the Rabi resonance is proportional to the amplitude of the oscillating exchange. A measurement of the Rabi resonance allows one to narrow the distribution of nuclear spin states and thereby to prolong the spin decoherence time. Further, we study decoherence of the two-electron states due to the hyperfine interaction and give requirements on the parameters of the system in order to initialize in the $\ket{\uparrow\downarrow}$--state and to perform a $\sqrt{\mathrm{SWAP}}$ operation with unit fidelity.
Coish William A.
Klauser D.
Loss Daniel
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