Multi-particle decoherence free subspaces in extended systems

ORAL

Abstract

A decoherence-free subspace (DFS) is a collection of states that are immune to the noise derived from interactions with the environment. DFS is especially of interest for states involving two or more particles and is considered a prominent candidate for quantum memory and quantum information processing. We develop a method for finding DFS in real quantum systems. For systems with a homogeneous environment and energy-conserving coupling to the particles in 3D space, our methods show that perfect DFS exists for co-located particles only . This restriction does not exist for confined systems, such as atoms embedded in an optical fiber.

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Authors

  • Raisa Karasik

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

  • Karl-Peter Marzlin

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

  • Barry Sanders

    University of Calgary, IQIS, University of Calgary

  • K. Birgitta Whaley

    BQIC and Dept. of Chemistry, University of California, Berkeley, University of California/Berkeley