期刊
APPLIED PHYSICS B-LASERS AND OPTICS
卷 81, 期 2-3, 页码 151-153出版社
SPRINGER
DOI: 10.1007/s00340-005-1917-z
关键词
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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.
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