Improving quantum gate fidelities by using a qubit to measure microwave pulse distortions
Journal article, 2013
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. © 2013 American Physical Society.
Author
S. Gustavsson
Massachusetts Institute of Technology (MIT)
O. Zwier
Massachusetts Institute of Technology (MIT)
University of Groningen
Jonas Bylander
Massachusetts Institute of Technology (MIT)
F. Yan
Massachusetts Institute of Technology (MIT)
F. Yoshihara
RIKEN
Y. Nakamura
University of Tokyo
RIKEN
T.P. Orlando
Massachusetts Institute of Technology (MIT)
W.D. Oliver
Massachusetts Institute of Technology (MIT)
Physical Review Letters
0031-9007 (ISSN) 1079-7114 (eISSN)
Vol. 110 4 040502-Subject Categories
Atom and Molecular Physics and Optics
Information Science
Nano Technology
Control Engineering
Condensed Matter Physics
DOI
10.1103/PhysRevLett.110.040502