We show a novel method for controlling the coupling of flux-based qubits by means of a superconducting transformer with variable flux transfer function. The device is realized by inserting a small hysteretic dc SQUID with unshunted junctions, working as a Josephson junction with flux controlled critical current, in parallel to a superconducting transformer; by varying the magnetic flux coupled to the dc-SQUID, the transfer function for the flux coupled to the transformer can be varied. Measurements carried out on a prototype at 4.2 K show a reduction factor of about 30 between the 'on' and the 'off' states. We discuss the system characteristics and the experimental results.
@article{arxiv.cond-mat/0403690,
title = {Controllable Flux Coupling for the Integration of Flux Qubits},
author = {C. Cosmelli and M. G. Castellano and F. Chiarello and R. Leoni and D. Simeone and G. Torrioli and P. Carelli},
journal= {arXiv preprint arXiv:cond-mat/0403690},
year = {2007}
}