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We introduce Cryoscope, a method for sampling on-chip baseband pulses used todynamically control qubit frequency in a quantum processor. We specifically useCryoscope to measure the step response of the dedicated flux control lines oftwo-junction transmon qubits in circuit QED processors with the temporalresolution of the room-temperature arbitrary waveform generator producing thecontrol pulses. As a first application, we iteratively improve this stepresponse using optimized real-time digital filters to counter thelinear-dynamical distortion in the control line, as needed for high-fidelity,repeatable one- and two-qubit gates based on dynamical control of qubitfrequency.

Time-domain characterization and correction of on-chip distortion of control pulses in a quantum processor