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Abstract: Coherent two-level systems, or qubits, based on electron spins in GaAsquantum dots are strongly coupled to the nuclear spins of the host lattice viathe hyperfine interaction. Realizing nuclear spin control would likely improveelectron spin coherence and potentially enable the nuclear environment to beharnessed for the long-term storage of quantum information. Toward this goal,we report experimental control of the relaxation of nuclear spin polarizationin a gate-defined two-electron GaAs double quantum dot. A cyclic gate-pulsesequence transfers the spin of an electron pair to the host nuclear system,establishing a local nuclear polarization that relaxes on a time scale ofseconds. We find nuclear relaxation depends on magnetic field andgate-controlled two-electron exchange, consistent with a model of electronmediated nuclear spin diffusion.



Autor: D. J. Reilly, J. M. Taylor, J. R. Petta, C. M. Marcus, M. P. Hanson, A. C. Gossard

Fuente: https://arxiv.org/



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