Ion Entanglement in Quantum Information Processing

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Science  04 Jun 2004:
Vol. 304, Issue 5676, pp. 1456-1457
DOI: 10.1126/science.1099639

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Quantum entanglement, in which the physical properties of particles become correlated, is an essential property of quantum information systems. In their Perspective, Cory and Havel discuss results reported in the same issue by Roos et al. and by Leibfried et al. in which trapped ions were put into entangled quantum states. The two complementary studies show that substantial progress is being made in quantum information processing and point to practical applications of entangled states.