Exchange Control of Nuclear Spin Diffusion in a Double Quantum Dot

@misc{citeulike:2837423, abstract = {Coherent two-level systems, or qubits, based on electron spins in GaAs quantum dots are strongly coupled to the nuclear spins of the host lattice via the hyperfine interaction. Realizing nuclear spin control would likely improve electron spin coherence and potentially enable the nuclear environment to be harnessed for the long-term storage of quantum information. Toward this goal, we report experimental control of the relaxation of nuclear spin polarization in a gate-defined two-electron GaAs double quantum dot. A cyclic gate-pulse sequence transfers the spin of an electron pair to the host nuclear system, establishing a local nuclear polarization that relaxes on a time scale of seconds. We find nuclear relaxation depends on magnetic field and gate-controlled two-electron exchange, consistent with a model of electron mediated nuclear spin diffusion.}, author = {Reilly, D. J. and Taylor, J. M. and Petta, J. R. and Marcus, C. M. and Hanson, M. P. and Gossard, A. C. }, citeulike-article-id = {2837423}, eprint = {0803.3082}, keywords = {diffusion, double-dot, nuclei, spin-qubit, sqbrclub}, month = {Mar}, posted-at = {2008-05-27 13:52:26}, priority = {3}, title = {Exchange Control of Nuclear Spin Diffusion in a Double Quantum Dot}, url = {http://arxiv.org/abs/0803.3082}, year = {2008} }

TY - ELEC ID - citeulike:2837423 L3 - citeulike-article-id:2837423 TI - Exchange Control of Nuclear Spin Diffusion in a Double Quantum Dot N2 - Coherent two-level systems, or qubits, based on electron spins in GaAs quantum dots are strongly coupled to the nuclear spins of the host lattice via the hyperfine interaction. Realizing nuclear spin control would likely improve electron spin coherence and potentially enable the nuclear environment to be harnessed for the long-term storage of quantum information. Toward this goal, we report experimental control of the relaxation of nuclear spin polarization in a gate-defined two-electron GaAs double quantum dot. A cyclic gate-pulse sequence transfers the spin of an electron pair to the host nuclear system, establishing a local nuclear polarization that relaxes on a time scale of seconds. We find nuclear relaxation depends on magnetic field and gate-controlled two-electron exchange, consistent with a model of electron mediated nuclear spin diffusion. KW - diffusion KW - double-dot KW - nuclei KW - spin-qubit KW - sqbrclub AU - Reilly, DJ AU - Taylor, JM AU - Petta, JR AU - Marcus, CM AU - Hanson, MP AU - Gossard, AC PY - 2008/Mar/20/ UR - http://arxiv.org/abs/0803.3082 ER -