IN-Situ Pulse Envelope Characterization Technique (INSPECT)

Precise characterization of control pulses is essential to building reliable quantum computers. We use qubits as probes to measure distortions in microwave pulses in the Fourier domain. This allows us to identify and characterize several mechanisms for pulse reflection without using a prescribed model. We also show that the distorted pulses can be deconvolved with one percent precision. Our method can also be used to characterize timing differences between different pulses with 10ps precision. Finally, we show that the pulse shapes for crosstalk are significantly distorted and delayed.