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Nature 455, 180-181 (11 September 2008) | doi:10.1038/455180a; Published online 10 September 2008
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Quantum mechanics: Entangled families
Markus Aspelmeyer1 & Jens Eisert2
Abstract
Quantum entanglement comes in a rich variety of types and families if more than two particles are involved. Experiments with photons are opening up fresh ways to systematically study multi-particle entanglement.
In 1935, one of the founders of quantum mechanics, Erwin Schrödinger, coined the term 'entanglement' to describe two quantum systems that are intimately correlated — even more strongly than is classically possible. Although its impact on the foundations of quantum physics was envisaged from the beginning (entanglement is at the heart of his famous cat paradox), Schrödinger could not have anticipated that it would become a basic concept in quantum information processing.
- Markus Aspelmeyer is at the Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, 1090 Vienna, Austria.
Email: markus.aspelmeyer@quantum.at - Jens Eisert is in the Department of Physics, University of Potsdam, 14469 Potsdam, Germany, and Imperial College London, UK.
Email: jense@qipc.org
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