Phys. Rev. B 80, 115326 (2009) [5 pages]Nuclear spin coherence in a quantum wireReceived 6 April 2009; revised 31 August 2009; published 29 September 2009 We have observed millisecond-long coherent evolution of nuclear spins in a quantum wire at 1.2 K. Local, all-electrical manipulation of nuclear spins is achieved by dynamic nuclear polarization in the breakdown regime of the integer quantum Hall effect combined with pulsed nuclear magnetic resonance. The excitation thresholds for the breakdown are significantly smaller than what would be expected for our sample and the direction of the nuclear polarization can be controlled by the voltage bias. As a four-level spin system, the device is equivalent to two qubits. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.115326
DOI:
10.1103/PhysRevB.80.115326
PACS:
76.70.Fz, 73.43.Fj, 73.63.Nm, 76.60.Es
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