Quantum Channel Capacities

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Science  19 Mar 2004:
Vol. 303, Issue 5665, pp. 1784-1787
DOI: 10.1126/science.1092381

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Virtually all of today's information technology is based on the manipulation of classical bits. Quantum systems offer the potential of a much more powerful computing technology, however. In their Perspective, Bennett and Shor discuss an important aspect of quantum computing--the theoretical capacity of a quantum information channel. Although a number of concepts can be carried over from classical information theory, quantum systems have their own unusual properties. Recently, researchers have been able to show that these unique quantum aspects can provide much higher information flow than previously expected.