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Quiet SDS Josephson Junctions for Quantum Computing

L. B. Ioffe·V. B. Geshkenbein·M. V. Feigelman·A. L. Fauchere·G. Blatter
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Abstract

Unconventional superconductors exhibit an order parameter symmetry lower than the symmetry of the underlying crystal lattice. Recent phase sensitive experiments on YBCO single crystals have established the d-wave nature of the cuprate materials, thus identifying unambiguously the first unconventional superconductor. The sign change in the order parameter can be exploited to construct a new type of s-wave - d-wave - s-wave Josephson junction exhibiting a degenerate ground state and a double-periodic current-phase characteristic. Here we discuss how to make use of these special junction characteristics in the construction of a quantum computer. Combining such junctions together with a usual s-wave link into a SQUID loop we obtain what we call a `quiet' qubit --- a solid state implementation of a quantum bit which remains optimally isolated from its environment.

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L. B. Ioffe, V. B. Geshkenbein, M. V. Feigelman, A. L. Fauchere, G. Blatter. 1999-01-11. Quiet SDS Josephson Junctions for Quantum Computing. https://doi.org/10.1038/19464

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