Error Filtration and Entanglement Purification for Quantum Communication

Details Error Filtration and Entanglement Purification for Quantum Communication Error Filtration and Entanglement Purification for Quantum Communication

2004-07-02

arxiv.org/abs/quant-ph/0407021v1

Phys. Rev. A 72, 012338 (2005)

Physics

Quantum Physics

23 pages (latex) and 4 postscript figures

Scientific paper

10.1103/PhysRevA.72.012338

The key realisation which lead to the emergence of the new field of quantum information processing is that quantum mechanics, the theory that describes microscopic particles, allows the processing of information in fundamentally new ways. But just as in classical information processing, errors occur in quantum information processing, and these have to be corrected. A fundamental breakthrough was the realisation that quantum error correction is in fact possible. However most work so far has not been concerned with technological feasibility, but rather with proving that quantum error correction is possible in principle. Here we describe a method for filtering out errors and entanglement purification which is particularly suitable for quantum communication. Our method is conceptually new, and, crucially, it is easy to implement in a wide variety of physical systems with present day technology and should therefore be of wide applicability.

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