Realistic Decoherence Free Subspaces

Details Realistic Decoherence Free Subspaces Realistic Decoherence Free Subspaces

2003-04-02

arxiv.org/abs/quant-ph/0304018v2

Physics

Quantum Physics

9 pages, no figures, submitted to Phys. Rev. A. This is a completelly rewritten and expanded version of quant-ph/0202031

Scientific paper

Decoherence free subspaces (DFS) is a theoretical tool towards experimental implementation of quantum information storage and processing. However, they represent an experimental challenge, since conditions for their existence are very stringent. This work explores the situation in which a system of $N$ oscillators coupled to a bath of harmonic oscillators is close to satisfy the conditions for the existence of DFS. We show, in the Born-Markov limit and for small deviations from separability and degeneracy conditions, that there are {\emph{weak decoherence subspaces}} which resemble the original notion of DFS.

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