  Scaling up superconducting quantum processors with optimized performance
requires a 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. At flux sensitive points of
operation, the ubiquitous presence of 1/f flux noise however gives rise to
dephasing by inducing fluctuations of the qubit frequency. We show how two-tone
modulation of the flux bias, a bichromatic modulation, gives rise to a
continuum of dynamical sweet spots where dephasing due to slow flux noise is
suppressed to first order for a wide range of time-averaged qubit frequencies.
The qubits can be operated at these dynamical sweet spots to realize protected
entangling gates and to avoid collisions with two-level-system defects.
