Session K5: Entanglement and Decoherence

2:00 PM–4:00 PM, Thursday, May 29, 2008
Nittany Lion Inn - Boardroom I

Chair: Chris Monroe, University of Maryland

Abstract: K5.00009 : Multi-particle decoherence free subspaces in extended systems

3:36 PM–3:48 PM

Preview Abstract

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)

  K. Birgitta Whaley
    (BQIC and Dept. of Chemistry, University of California, Berkeley)

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.