Tunable coupling of flux qubits through a simple flux transformer

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  • 7 January 2005
Abstract
We sketch the way in which a monostable rf-SQUID can mediate an inductive coupling between two adjacent flux qubits. The nontrivial dependence of the SQUID's susceptibility on external flux makes it possible to continuously tune the induced coupling from antiferromagnetic (AF) to ferromagnetic (FM). In particular, for suitable parameters, the induced FM coupling can be sufficiently large to overcome any possible direct AF inductive coupling between the flux qubits.

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