Superconducting Qubits--a Major Roadblock Dissolved?

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Science  03 May 2002:
Vol. 296, Issue 5569, pp. 861-862
DOI: 10.1126/science.1071703

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Decoherence is thought to be a major obstacle in using macroscopic quantum states for quantum computing applications. In his Perspective, Leggett highlights the two independent experiments by Vion et al . and Yu et al . showing that long coherence times can be achieved. The reports indicate that whatever the difficulties that may be encountered in the attempt to build a quantum computer with Josephson circuits, decoherence need not be among them.