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Soft-pulse dynamical decoupling with Markovian decoherence

Source: Phys. Rev. A 80, 042317 (2009); doi:10.1103/PhysRevA.80.042317

Published 20 October 2009

KEYWORDS and PACS
Keywords
PACS
  • 03.67.Lx
    Quantum computation architectures and implementations
  • 75.40.Gb
    Dynamic properties of magnetic materials
  • YEAR: 2009
PUBLICATION DATA
Publisher:
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Leonid P. Pryadko
Department of Physics & Astronomy, University of California, Riverside, California, 92521 USA

Gregory Quiroz
Department of Physics, University of Southern California, Los Angeles, California 90089, USA
We consider the effect of broadband decoherence on the performance of refocusing sequences, having in mind applications of dynamical decoupling in concatenation with quantum error correcting codes as the first stage of coherence protection. Specifically, we construct cumulant expansions of effective decoherence operators for a qubit driven by a pulse of a generic symmetric shape and for several sequences of pi and pi/2 pulses. While, in general, the performance of soft pulses in decoupling sequences in the presence of Markovian decoherence is worse than that of the ideal delta pulses, it can be substantially improved by shaping. ©2009 The American Physical Society
History: Received 7 July 2009; published 20 October 2009
Permalink: http://link.aps.org/abstract/PRA/v80/e042317
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