D. M. Heim, K. Vogel, W. P. Schleich, D. Koelle, R. Kleiner, E. Goldobin
We propose a concept of a qubit based on two coupled fractional vortices pinned at two artificially created $\kappa$ discontinuities of the Josephson phase in a long Josephson junction. Each discontinuity can be created by a pair of tiny current injectors with the current $I_\mathrm{inj}$ applied. We map the dynamics of the system to the dynamics of a single particle in a double-well potential and calculate the effective parameters of this potential. By tuning the discontinuities $\kappa \propto I_\mathrm{inj}$ during the experiment we are able to control the parameters of the effective double-well potential as well as to initialize the fractional vortex molecule to a desired state. The system can be used to study macroscopic quantum phenomena involving tailored vortex matter.
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http://arxiv.org/abs/1208.6176
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