A scalable, tunable qubit, based on a clean DND or grain boundary D-D junction

Details A scalable, tunable qubit, based on a clean DND or grain boundary D-D junction A scalable, tunable qubit, based on a clean DND or grain boundary D-D junction

1999-03-10

arxiv.org/abs/cond-mat/9903170v1

Physics

Condensed Matter

Superconductivity

8 pages, 3 figures

Scientific paper

Unique properties of a ballistic DND or grain boundary D-D junction, including doubly degenerate ground state with tunable potential barrier between the "up" and "down" states and non-quantized spontaneous magnetic flux, make it a good candidate for a solid state qubit. The role of quantum "spin" variable is played by the sign of equilibrium superconducting phase difference on the junction, which is revealed in the direction of spontaneous supercurrent flow in equilibrium. Possibilities of design-specific simultaneous operations with several integrated qubits are discussed.

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