Time-domain characterization and correction of on-chip distortion of control pulses in a quantum processor
M. A. Rol (TU Delft - QCD/DiCarlo Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
L. Ciorciaro (ETH Zürich, TU Delft - QCD/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre)
F. K. Malinowski (TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
B. M. Tarasinski (Kavli institute of nanoscience Delft, TU Delft - QCD/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre)
R. E. Sagastizabal (TU Delft - QCD/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
C. C. Bultink (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - ALG/General)
Y. Salathe (Zurich Instruments AG)
N. Haandbaek (Zurich Instruments AG)
J. Sedivy (Zurich Instruments AG)
L. Dicarlo (Kavli institute of nanoscience Delft, TU Delft - QCD/DiCarlo Lab, TU Delft - QN/DiCarlo Lab, TU Delft - QuTech Advanced Research Centre)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
We introduce Cryoscope, a method for sampling on-chip baseband pulses used to dynamically control qubit frequency in a quantum processor. We specifically use Cryoscope to measure the step response of the dedicated flux control lines of two-junction transmon qubits in circuit QED processors with the temporal resolution of the room-temperature arbitrary waveform generator producing the control pulses. As a first application, we iteratively improve this step response using optimized real-time digital filters to counter the linear-dynamical distortion in the control line, as needed for high-fidelity repeatable one- and two-qubit gates based on dynamical control of qubit frequency.