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arXiv:0807.1987 · Physics Letters A

Entanglement dynamics of coupled qubits and a semi-decoherence free subspace

Gabriele Campagnano, Alioscia Hamma, Ulrich Weiß

Published Nov 5, 2009• 11 citations
arXivHTMLPDF
DOI
10.1016/j.physleta.2009.10.081

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Coherence in an open quantum system is degraded through its interaction with a bath. This decoherence can be avoided by restricting the dynamics of the system to special decoherence-free subspaces. These subspaces are usually constructed under the assumption of spatially symmetric system-bath coupling. Here we show that decoherence-free subspaces may appear without spatial symmetry. Instead, we consider a model of system-bath interactions in which to first order only multiple-qubit coupling to the bath is present, with single-qubit system-bath coupling absent. We derive necessary and sufficient conditions for the appearance of decoherence-free states in this model, and give a number of examples. In a sequel paper we show how to perform universal and fault tolerant quantum computation on the decoherence-free subspaces considered in this paper.