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(a) Schematic of the measurement setup. (b) Envelopes of the microwave pulses used in a geometric phase measurement. The measurement consists of a series of resonant (ωα) and off-resonant (ωα) pulses applied either on the x-quadrature (blue) or the y-quadrature (green). The geometric phase is generated by the adiabatic evolution between the resonant pulses. (c) Geometric phase acquired by the qubit vs. solid angle spanned by the path traced out by the qubit. The results of the measurement described in b (dots) are superimposed with the theoretical curves obtained with second-order perturbation theory (continuous lines) and Berry’s prediction for a two-level-system (grey dashed line). The off-resonant pulses were applied with detuning Δ=50 MHz (green) and Δ=−50 MHz (blue).