Improving Quantum Gate Fidelities by Using a Qubit to Measure Microwave Pulse Distortions

Simon Gustavsson, Olger Zwier, Jonas Bylander, Fei Yan, Fumiki Yoshihara, Yasunobu Nakamura, Terry P. Orlando, and William D. Oliver
Phys. Rev. Lett. 110, 040502 – Published 24 January 2013
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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.

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  • Received 2 November 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.040502

© 2013 American Physical Society

Authors & Affiliations

Simon Gustavsson1, Olger Zwier1,2, Jonas Bylander1, Fei Yan3, Fumiki Yoshihara4, Yasunobu Nakamura4,5, Terry P. Orlando1, and William D. Oliver1,6

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 2Zernike Institute for Advanced Materials, University of Groningen, 9747AG Groningen, The Netherlands
  • 3Department of Nuclear Science and Engineering, MIT, Cambridge, Massachusetts 02139, USA
  • 4The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
  • 5Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8904, Japan
  • 6MIT Lincoln Laboratory, 244 Wood Street, Lexington, Massachusetts 02420, USA

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Issue

Vol. 110, Iss. 4 — 25 January 2013

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