  We show that two superconducting qubits interacting via a fixed transversal
coupling can be decoupled by appropriately-designed microwave feld excitations
applied to each qubit. This technique is useful for removing the effects of
spurious interactions in a quantum processor. We also simulate the case of a
qubit coupled to a two-level system (TLS) present in the insulating layer of
the Josephson junction of the qubit. Finally, we discuss the qubit-TLS problem
in the context of dispersive measurements, where the qubit is coupled to a
resonator.
