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.


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


Y. Nakamura

University of Tokyo


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



More information

Latest update