Optimization of Qubit Operations in the Presence of Spatially-Correlated Noise

ORAL

Abstract

A large class of semiconductor spin qubits suffer primarily from slow charge noise, which may be expected to exhibit spatial correlations in small multiqubit devices. We demonstrate strategies for the measurement of these spatial correlations using existing hardware. We then show how to use this information to optimize the operation of the device, using the idea of an approximately decoherence-free subspace. Specific circuits for various quantum information-processing tasks are presented for qubits that use the CPhase rather than the CNOT as the entangling gate. A programmable 2-qubit device with such gates has recently come into operation [T.F. Watson et al, arXiv:1708.04214]

*Research was sponsored by the Army Research Office (ARO), and was accomplished under Grant Number W911NF-17-1-0274. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army R

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Presenters

  • Vickram Premakumar

    • Univ of Wisconsin, Madison
    • Physics, Univ of Wisconsin, Madison

Authors

  • Vickram Premakumar

    • Univ of Wisconsin, Madison
    • Physics, Univ of Wisconsin, Madison

  • Ekmel Ercan

    • Univ of Wisconsin, Madison
    • Physics, Univ of Wisconsin, Madison

  • Joydip Ghosh

    • Univ of Wisconsin, Madison
    • Department of Physics, Univ of Wisconsin, Madison
    • Physics, Univ of Wisconsin, Madison

  • Mark Friesen

    • Physics, University of Wisconsin-Madison
    • Univ of Wisconsin, Madison
    • University of Wisconsin-Madison
    • Department of Physics, Univ of Wisconsin, Madison
    • Department of Physics, University of Wisconsin - Madison
    • Department of Physics, University of Wisconsin-Madison
    • Physics, Univ of Wisconsin, Madison

  • M. A. Eriksson

    • Physics, University of Wisconsin-Madison
    • University of Wisconsin-Madison
    • Physics, University of Wisconsin: Madison
    • Univ of Wisconsin, Madison
    • Department of Physics, University of Wisconsin-Madison

  • Susan Coppersmith

    • Physics, University of Wisconsin-Madison
    • Univ of Wisconsin, Madison
    • University of Wisconsin-Madison
    • Physics, University of Wisconsin: Madison
    • Department of Physics, Univ of Wisconsin, Madison
    • Department of Physics, University of Wisconsin - Madison
    • Department of Physics, University of Wisconsin-Madison
    • Physics, Univ of Wisconsin, Madison

  • Robert Joynt

    • Department of Physics, University of Wisconsin-Madison
    • Univ of Wisconsin, Madison
    • Physics, Univ of Wisconsin, Madison