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.

–

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