, Volume 81, Issue 2-3, pp 151-153
Date: 15 Jul 2005

Robust entanglement

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Abstract

It is common belief among physicists that entangled states of quantum systems lose their coherence rather quickly. The reason is that any interaction with the environment which distinguishes between the entangled sub-systems collapses the quantum state. Here we investigate entangled states of two trapped Ca+ ions and observe robust entanglement lasting for more than 20 s.