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Qubits based on the magnetic flux degree of freedom require a flux bias,whose stability and precision strongly affect the qubit performance, up to apoint of forbidding the qubit operation. Moreover, in the perspective ofmultiqubit systems, it must be possible to flux-bias each qubit independently,hence avoiding the traditional use of externally generated magnetic fields infavour of on-chip techniques that minimize cross-couplings. The solutiondiscussed in this paper exploits a persistent current, trapped in asuperconducting circuit integrated on chip that can be inductively coupled withan individual qubit. The circuit does not make use of resistive elements thatcan be detrimental for the qubit coherence. The trapping procedure allows tocontrol and change stepwise the amount of stored current; after that, thecircuit can be completely disconnected from the external sources. We show in apractical case how this works and how to drive the bias circuit at the requiredvalue.Comment: 5 figures submitted to Superconductor Science and Technolog

Static flux bias of a flux qubit using persistent current trapping