Print Email Facebook Twitter Nuclear spin dynamics in double quantum dots: Multistability, dynamical polarization, criticality, and entanglement Title Nuclear spin dynamics in double quantum dots: Multistability, dynamical polarization, criticality, and entanglement Author Schuetz, M.J.A. Kessler, E.M. Vandersypen, L.M.K. Cirac, J.I. Giedke, G. Faculty Applied Sciences Department QN/Quantum Nanoscience Date 2014-05-27 Abstract We theoretically study the nuclear spin dynamics driven by electron transport and hyperfine interaction in an electrically defined double quantum dot in the Pauli-blockade regime. We derive a master-equation-based framework and show that the coupled electron-nuclear system displays an instability towards the buildup of large nuclear spin polarization gradients in the two quantum dots. In the presence of such inhomogeneous magnetic fields, a quantum interference effect in the collective hyperfine coupling results in sizable nuclear spin entanglement between the two quantum dots in the steady state of the evolution. We investigate this effect using analytical and numerical techniques, and demonstrate its robustness under various types of imperfections. To reference this document use: http://resolver.tudelft.nl/uuid:f7d6c7c3-1107-419b-8099-b05f568cf853 DOI https://doi.org/10.1103/PhysRevB.89.195310 Publisher American Physical Society ISSN 1098-0121 Source http://journals.aps.org/prb/abstract/10.1103/PhysRevB.89.195310 Source Physical Review B, 89 (19), 2014 Part of collection Institutional Repository Document type journal article Rights © 2014 American Physical Society Files PDF Vandersypen_2014.pdf 1.75 MB Close viewer /islandora/object/uuid:f7d6c7c3-1107-419b-8099-b05f568cf853/datastream/OBJ/view