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Rapid Single-Shot Measurement of a Singlet-Triplet Qubit

Source: Phys. Rev. Lett. 103, 160503 (2009); doi:10.1103/PhysRevLett.103.160503

Published 14 October 2009

EPAPS
PACS
  • 03.67.Lx
    Quantum computation architectures and implementations
  • 73.63.Kv
    Quantum dots (electronic transport)
  • YEAR: 2009
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PUBLICATION DATA
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C. Barthel,1 D. J. Reilly,1,2 C. M. Marcus,1 M. P. Hanson,3 and A. C. Gossard3
1Department of Physics, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA
2School of Physics, University of Sydney, Sydney, 2006, Australia
3Materials Department, University of California, Santa Barbara, California 93106, USA
We report repeated single-shot measurements of the two-electron spin state in a GaAs double quantum dot. The readout allows measurement with a fidelity above 90% with a ~7 µs cycle time. Hyperfine-induced precession between singlet and triplet states of the two-electron system are directly observed, as nuclear Overhauser fields are quasistatic on the time scale of the measurement cycle. Repeated measurements on millisecond to second time scales reveal the evolution of the nuclear environment. ©2009 The American Physical Society
History: Received 2 February 2009; published 14 October 2009
Permalink: http://link.aps.org/abstract/PRL/v103/e160503

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