Universal dynamical control of decay and decoherence for weak and strong system-bath coupling

  • Authors:

  • G. Gordon;G. Kurizki;A. G. Kofman;S. Pellegrin

  • Affiliations:

  • Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel;Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel;Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel;Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel

  • Venue:
  • Quantum Information & Computation
  • Year:
  • 2005

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Abstract

A untied theory is given of dynamically modified decay and decoherence in driventwo-level and multilevel quantum systems that are weakly coupled to arbitrary finite-temperature reservoirs and undergo random phase fluctuations. Criteria for the opti-mization of decoherence suppression and the limitations of this approach are obtained.For a driven qubit that is strongly coupled to the continuum edge of reservoir's spectrum,we demonstrate that only an appropriately ordered sequence of abrupt changes of theresonance frequency, near the continuum edge, can effectively protect the qubit statefrom decoherence.