Exchange Control of Nuclear Spin Diffusion in a Double Quantum Dot

Details Exchange Control of Nuclear Spin Diffusion in a Double Quantum Dot Exchange Control of Nuclear Spin Diffusion in a Double Quantum Dot

2008-03-20

arxiv.org/abs/0803.3082v1

Physical Review Letters 104, 236802 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related papers at http://marcuslab.harvard.edu

Scientific paper

10.1103/PhysRevLett.104.236802

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.

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