The Quandary of Quantum Information

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Science  14 Sep 2001:
Vol. 293, Issue 5537, pp. 2026-2027
DOI: 10.1126/science.293.5537.2026

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The past few years have seen a flurry of advances in quantum computing, as physicists figure out how to use quantum information to perform feats that are impossible in the classical world. Yet even as theorists crank out quantum software, they have been astonished to discover that a phenomenon long considered essential for quantum computing--entanglement--appears to be dispensable after all. That leaves them wondering just which exotic properties of the quantum realm combine to give quantum computers their incredible potential.