Nuclear Spin Qubit Dephasing Time in the Integer Quantum Hall Effect Regime

Details Nuclear Spin Qubit Dephasing Time in the Integer Quantum Hall Effect Regime Nuclear Spin Qubit Dephasing Time in the Integer Quantum Hall Effect Regime

2000-02-23

arxiv.org/abs/cond-mat/0002350v2

Physical Review B 63, item 085313, pages 1-6 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

19 pages in plain TeX

Scientific paper

10.1103/PhysRevB.63.085313

We report the first theoretical estimate of the nuclear-spin dephasing time T_2 owing to the spin interaction with the two-dimensional electron gas, when the latter is in the integer quantum Hall state, in a two-dimensional heterojunction or quantum well at low temperature and in large applied magnetic field. We establish that the leading mechanism of dephasing is due to the impurity potentials that influence the dynamics of the spin via virtual magnetic spin-exciton scattering. Implications of our results for implementation of nuclear spins as quantum bits (qubits) for quantum computing are discussed.

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