Improving Quantum Gate Fidelities by Using a Qubit to Measure Microwave Pulse Distortions
Name
Gustavsson-2013-Improving Quantum Gate Fidelities by Using a Qubit.pdf
Size
456.51 KB
Format
Adobe PDF
Checksum (MD5)
7f8876195aa21d10417648e3ce2bef11
Author(s)
Gustavsson, Simon
Zwier, Olger
Bylander, Jonas
Yan, Fei
Yoshihara, Fumiki
Nakamura, Yasunobu
Orlando, Terry Philip
Oliver, William D.
Date Issued
January 2013
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevLett.110.040502
