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Controllable Flux Coupling for the Integration of Flux Qubits

C. Cosmelli·M. G. Castellano·F. Chiarello·R. Leoni·D. Simeone·G. Torrioli·P. Carelli
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Abstract

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.

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C. Cosmelli, M. G. Castellano, F. Chiarello, R. Leoni, D. Simeone, G. Torrioli, P. Carelli. 2004-03-29. Controllable Flux Coupling for the Integration of Flux Qubits. https://arxiv.org/abs/cond-mat/0403690

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