Composite pulses robust against charge noise and magnetic field noise for universal control of a singlet-triplet qubit

ORAL

Abstract

We generalize our SUPCODE pulse sequences [1] for singlet-triplet qubits to correct errors from imperfect control. This yields gates that are simultaneously corrected for both charge noise and magnetic field gradient fluctuations, addressing the two dominant $T_2^*$ processes. By using this more efficient version of SUPCODE, we are able to introduce this capability while also substantially reducing the overall pulse time compared to the previous sequence. We show that our sequence remains realistic under experimental constraints such as finite bandwidth. [1] Wang et al., ``Composite pulses for robust universal control of singlet-triplet qubits'', Nat. Commun. 3, 997 (2012)

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Authors

  • Xin Wang

    Condensed Matter Theory Center, University of Maryland, College Park

  • Edwin Barnes

    Condensed Matter Theory Center, University of Maryland, Condensed Matter Theory Center, University of Maryland, College Park

  • Jason Kestner

    Department of Physics, University of Maryland, Baltimore County, and Condensed Matter Theory Center, University of Maryland, College Park, Department of Physics, University of Maryland, Baltimore County and Condensed Matter Theory Center, University of Maryland, College Park, University of Maryland, Baltimore County

  • Lev S. Bishop

    University of Maryland, JQI and CMTC, University of Maryland, College Park, Condensed Matter Theory Center and Joint Quantum Institute, University of Maryland, College Park

  • Sankar Das Sarma

    The University of Maryland, College Park, University of Maryland-College Park, Condensed Matter Theory Center, University of Maryland, Condensed Matter Theory Center and Joint Quantum Institute, University of Maryland, College Park