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Proceedings Paper

Prolonging qubit coherence: dynamical decoupling schemes studied in a Penning ion trap
Author(s): Hermann Uys; Michael J. Biercuk; Aaron P. VanDevender; Nobuyasu Shiga; Wayne M. Itano; John J. Bollinger
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Paper Abstract

We present a study of dynamical decoupling schemes for the suppression of phase errors from various noise environments using ions in a Penning trap as a model ensemble of qubits. By injecting frequency noise we demonstrate that in an ohmic noise spectrum with a sharp, high-frequency cutoff the recently proposed UDD decoupling sequence gives noise suppression superior to the traditional CPMG technique. Under only the influence of ambient magnetic field fluctuations with a 1/ω4 power spectrum, we find little benefit from using the UDD sequence, consistent with theoretical predictions for dynamical decoupling performance in the presence of noise spectra with soft cutoffs. Finally, we implement an optimization algorithm using measurement feedback, demonstrating that local optimization of dynamical decoupling can further lead to significant gains in error suppression over known sequences.

Paper Details

Date Published: 2 February 2009
PDF: 9 pages
Proc. SPIE 7225, Advanced Optical Concepts in Quantum Computing, Memory, and Communication II, 72250R (2 February 2009); doi: 10.1117/12.823179
Show Author Affiliations
Hermann Uys, National Institute of Standards and Technology (United States)
Council for Scientific and Industrial Research (United States)
Michael J. Biercuk, National Institute of Standards and Technology (United States)
Georgia Institute of Technology (United States)
Aaron P. VanDevender, National Institute of Standards and Technology (United States)
Nobuyasu Shiga, National Institute of Standards and Technology (United States)
Wayne M. Itano, National Institute of Standards and Technology (United States)
John J. Bollinger, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 7225:
Advanced Optical Concepts in Quantum Computing, Memory, and Communication II
Zameer U. Hasan; Alan E. Craig; Philip R. Hemmer, Editor(s)

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