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]

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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