Local current injection into mesoscopic superconductors for the manipulation of quantum states

Details Local current injection into mesoscopic superconductors for the manipulation of quantum states Local current injection into mesoscopic superconductors for the manipulation of quantum states

2009-11-06

arxiv.org/abs/0911.1199v1

Physics

Condensed Matter

Superconductivity

To appear in Physical Review Letters

Scientific paper

We perform strategic current injection in a small mesoscopic superconductor and control the (non)equilibrium quantum states in an applied homogeneous magnetic field. In doing so, we realize a current-driven splitting of multi-quanta vortices, current-induced transitions between states with different angular momenta, and current-controlled switching between otherwise degenerate quantum states. These fundamental phenomena form the basis for discussed electronic and logic applications, and are confirmed in both theoretical simulations and multiple-small-tunnel-junction transport measurements.

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