Suppressing Spin Qubit Dephasing by Nuclear State Preparation

Details Suppressing Spin Qubit Dephasing by Nuclear State Preparation Suppressing Spin Qubit Dephasing by Nuclear State Preparation

2008-07-09

arxiv.org/abs/0807.1445v1

Science 321, 718 (2008).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Supporting material available at http://marcuslab.harvard.edu/papers.shtml

Scientific paper

Coherent spin states in semiconductor quantum dots offer promise as electrically controllable quantum bits (qubits) with scalable fabrication. For few-electron quantum dots made from gallium arsenide (GaAs), fluctuating nuclear spins in the host lattice are the dominant source of spin decoherence. We report a method of preparing the nuclear spin environment that suppresses the relevant component of nuclear spin fluctuations below its equilibrium value by a factor of ~ 70, extending the inhomogeneous dephasing time for the two-electron spin state beyond 1 microsecond. The nuclear state can be readily prepared by electrical gate manipulation and persists for > 10 seconds.

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