Composite pulse sequences for robust universal control of singlet-triplet qubits

ORAL

Abstract

We consider composite pulse sequences for the exchange interaction in singlet-triplet qubits, in the presence of a finite magnetic field gradient (producing a term in the Hamiltonian similar in magnitude to the exchange interaction). We find pulse sequences achieving arbitrary rotations on the Bloch sphere, for which there is no first-order term in the error arising from fluctuations of the magnetic field gradient. We quantify the range of experimental parameters where our composite sequences can outperform naive uncorrected sequences.

*Support from JQI, IARPA, LPS-CMTC, CNAM

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Authors

  • Lev Bishop

    • Joint Quantum Institute and Condensed Matter Theory Center, University of Maryland, College Park
    • Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park
    • Joint Quantum Institute and CMTC

  • Xin Wang

    • Condensed Matter Theory Center, University of Maryland, College Park
    • Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park

  • Edwin Barnes

    • Condensed Matter Theory Center, Dept. of Physics, University of Maryland
    • Condensed Matter Theory Center, University of Maryland, College Park
    • Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park

  • Jason Kestner

    • Condensed Matter Theory Center, University of Maryland, College Park
    • Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park
    • Condensed Matter Theory Center, Department of Physics, University of Maryland - College Park

  • Kai Sun

    • University of Maryland
    • Condensed Matter Theory Center, University of Maryland, College Park
    • Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park
    • Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742
    • University of Maryland, College Park

  • Sankar Das Sarma

    • Department of Physics, University of Maryland
    • Condensed Matter Theory Center, Dept. of Physics, University of Maryland
    • Condensed Matter Theory Center, University of Maryland, College Park
    • Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park
    • University of Maryland, College Park
    • Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742
    • Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA
    • CMTC, UMD, College Park