Charge and spin manipulation in a few-electron double dot

Details Charge and spin manipulation in a few-electron double dot Charge and spin manipulation in a few-electron double dot

2005-10-06

arxiv.org/abs/cond-mat/0510151v1

Physica E 34, 42 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Presented at EP2DS-16, to be published in Physica E

Scientific paper

10.1016/j.physe.2006.02.033

We demonstrate high speed manipulation of a few-electron double quantum dot. In the one-electron regime, the double dot forms a charge qubit. Microwaves are used drive transitions between the (1,0) and (0,1) charge states of the double dot. A local quantum point contact charge detector measures the photon-induced change in occupancy of the charge states. Charge detection is used to measure T1~16 ns and also provides a lower bound estimate for T2* of 400 ps for the charge qubit. In the two-electron regime we use pulsed-gate techniques to measure the singlet-triplet relaxation time for nearly-degenerate spin states. These experiments demonstrate that the hyperfine interaction leads to fast spin relaxation at low magnetic fields. Finally, we discuss how two-electron spin states can be used to form a logical spin qubit.

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