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We present a superconducting qubit for the circuit quantum electrodynamicsarchitecture that has a tunable coupling strength g. We show that this couplingstrength can be tuned from zero to values that are comparable with othersuperconducting qubits. At g = 0 the qubit is in a decoherence free subspacewith respect to spontaneous emission induced by the Purcell effect. Furthermorewe show that in the decoherence free subspace the state of the qubit can stillbe measured by either a dispersive shift on the resonance frequency of theresonator or by a cycling-type measurement.

A superconducting qubit with Purcell protection and tunable coupling