• Letter

Restless Tuneup of High-Fidelity Qubit Gates

M. A. Rol, C. C. Bultink, T. E. O’Brien, S. R. de Jong, L. S. Theis, X. Fu, F. Luthi, R. F. L. Vermeulen, J. C. de Sterke, A. Bruno, D. Deurloo, R. N. Schouten, F. K. Wilhelm, and L. DiCarlo
Phys. Rev. Applied 7, 041001 – Published 24 April 2017
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Abstract

We present a tuneup protocol for qubit gates with tenfold speedup over traditional methods reliant on qubit initialization by energy relaxation. This speedup is achieved by constructing a cost function for Nelder-Mead optimization from real-time correlation of nondemolition measurements interleaving gate operations without pause. Applying the protocol on a transmon qubit achieves 0.999 average Clifford fidelity in one minute, as independently verified using randomized benchmarking and gate-set tomography. The adjustable sensitivity of the cost function allows the detection of fractional changes in the gate error with a nearly constant signal-to-noise ratio. The restless concept demonstrated can be readily extended to the tuneup of two-qubit gates and measurement operations.

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  • Received 22 November 2016

DOI:https://doi.org/10.1103/PhysRevApplied.7.041001

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

M. A. Rol1,2, C. C. Bultink1,2, T. E. O’Brien3, S. R. de Jong1,2, L. S. Theis4, X. Fu1, F. Luthi1,2, R. F. L. Vermeulen1,2, J. C. de Sterke5,1, A. Bruno1,2, D. Deurloo6,1, R. N. Schouten1,2, F. K. Wilhelm4, and L. DiCarlo1,2

  • 1QuTech, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands
  • 2Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands
  • 3Instituut-Lorentz for Theoretical Physics, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands
  • 4Theoretical Physics, Saarland University, 66123 Saarbrucken, Germany
  • 5Topic Embedded Systems B.V., P.O. Box 440, 5680 AK Best, The Netherlands
  • 6Netherlands Organisation for Applied Scientific Research (TNO), P.O. Box 155, 2600 AD Delft, The Netherlands

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Issue

Vol. 7, Iss. 4 — April 2017

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