Reducing dephasing for flux control of superconducting qubits

Scaling up superconducting quantum processors with optimized performance requires sufficient flexibility in the choice of operating points for single and two qubit gates to maximize their fidelity and cope with imperfections. Flux control is an efficient technique to manipulate the parameters of tunable qubits, in particular to activate entangling gates. It however suffers from enhanced dephasing, induced by the ubiquitous 1/f flux noise at flux sensitive points of operation. We consider how flux pulses can protect a tunable qubit from slow flux noise for a range of frequencies in the tunability band. Preserving long coherence times during qubit interactions could furthermore alleviate the constraints on coupling strength and unlocks high fidelities for both single and two qubit gates in a scalable architecture based on static couplings.