Decoherence-free subspaces and incoherently generated coherences

ORAL

Abstract

A decoherence-free subspace (DFS) is a collection of states that is immune to the dominant noise effects created by the environment. DFS is usually studied for states involving two or more particles and is considered a prominent candidate for quantum memory and quantum information processing. We present rigorous criteria for the existence of DFS in finite-dimensional systems coupled to the Markovian reservoirs. This allows us to identify a new special class of decoherence free states that relies on rather counterintuitive phenomenon, which we call an ``incoherent generation of coherences.'' We provide examples of physical systems that support such states.

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Authors

  • Raisa Karasik

    • BQIC and Applied Science \& Technology, University of Califonia, Berkeley

  • Karl-Peter Marzlin

    • IQIS, University of Calgary

  • Barry C. Sanders

    • IQIS, University of Calgary
    • University of Calgary
    • Institute for Quantum Information Science, University of Calgary

  • K. Birgitta Whaley

    • BQIC and Dept. of Chemistry, University of California, Berkeley
    • University of California, Berkeley
    • Department of Chemistry and Kenneth S. Pitzer Center for Theoretical Chemistry, University of California, Berkeley, CA 94720