Improving Quantum Gate Fidelities by Using a Qubit to Measure Microwave Pulse Distortions
Author(s)
Gustavsson, Simon; Zwier, Olger; Bylander, Jonas; Yan, Fei; Yoshihara, Fumiki; Nakamura, Yasunobu; Orlando, Terry Philip; Oliver, William D.; ... Show more Show less
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We present a new method for determining pulse imperfections and improving the single-gate fidelity in a superconducting qubit. By applying consecutive positive and negative π pulses, we amplify the qubit evolution due to microwave pulse distortions, which causes the qubit state to rotate around an axis perpendicular to the intended rotation axis. Measuring these rotations as a function of pulse period allows us to reconstruct the shape of the microwave pulse arriving at the sample. Using the extracted response to predistort the input signal, we are able to reduce the average error per gate by 37%, which enables us to reach an average single-qubit gate fidelity higher than 0.998.
Date issued
2013-01Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Research Laboratory of ElectronicsJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Gustavsson, Simon et al. “Improving Quantum Gate Fidelities by Using a Qubit to Measure Microwave Pulse Distortions.” Physical Review Letters 110.4 (2013). © 2013 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114