Dynamical decoupling efficiency versus quantum non-Markovianity

Carole Addis, Francesco Ciccarello, Michele Cascio, G. Massimo Palma, Sabrina Maniscalco

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23 Citations (Scopus)
41 Downloads (Pure)

Abstract

We investigate the relationship between non-Markovianity and the effectiveness of a dynamical decoupling (DD) protocol for qubits undergoing pure dephasing. We consider an exact model in which dephasing arises due to a bosonic environment with a spectral density of the Ohmic class. This is parametrized by an Ohmicity parameter by changing which we can model both Markovian and non-Markovian environments. Interestingly, we find that engineering a non-Markovian environment is detrimental to the efficiency of the DD scheme, leading to a worse coherence preservation. We show that each DD pulse reverses the flow of quantum information and, on this basis, we investigate the connection between DD efficiency and the reservoir spectral density. Finally, in the spirit of reservoir engineering, we investigate the optimum system-reservoir parameters for achieving maximum stationary coherences.

Original languageEnglish
Article number123004
JournalNew Journal of Physics
Volume17
Issue number12
DOIs
Publication statusPublished - Dec 2015

Keywords

  • dynamical decoupling
  • non-Markovianity
  • Ohmic spectra
  • open quantum systems
  • pure dephasing
  • reservoir engineering

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Addis, C., Ciccarello, F., Cascio, M., Palma, G. M., & Maniscalco, S. (2015). Dynamical decoupling efficiency versus quantum non-Markovianity. New Journal of Physics, 17(12), [123004]. https://doi.org/10.1088/1367-2630/17/12/123004