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Science 23 October 1998:
Vol. 282. no. 5389, p. 589
DOI: 10.1126/science.282.5389.589a
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Quantum states can be correlated at a distance. This effect, called entanglement, is one of the fundamental ways in which the quantum realm differs from the classical. Furusawa et al. (p. 706; see the Perspective by Caves) report that continuous quantum variables, in this case the amplitude and phase of an optical field, can be teleported (sent by classical channels) between a sending and receiving station. The signal enters and leaves the sending and receiving stations independently through a third system and is not destroyed in the measurement process. Without entanglement, the fidelity of transmission did not exceed 50%; with the use of entangled states, the authors achieve a fidelity of 58%.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)