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Measurement of the soft 0-pi qubit with small junction and inductive energies

ORAL

Abstract

Optimization of the soft 0-pi qubit requires a design space trade-off between noise protection and inductive leakage to neighboring states. In this talk, we present preliminary measurement results of a soft 0-pi qubit with small EJ and EL. While this parameter regime could be preferable in reducing leakage to neighboring states during gate operation, it could lead to smaller relaxation protection between the two logical states of the qubit. Additionally, we expect to achieve coherent qubit control using a Raman transition with an ancillary level located at relatively lower frequency. To measure the soft 0-pi qubit in this regime, we first employed an offset-charge calibration technique based on the variance of two quasiparticle parity states in the I-Q plane. Next, we show spectroscopy measurements together with a fit to a soft zero-pi qubit Hamiltonian. Finally, we explain the current challenges and the outlook to move beyond the limitations of the soft 0-pi qubit.

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Presenters

  • Junyoung An

    Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT

Authors

  • Junyoung An

    Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT

  • Agustin Di Paolo

    Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology

  • Ilan T Rosen

    Stanford Univ, Massachusetts Institute of Technology

  • Roni Winik

    Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT

  • Leon Ding

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology

  • Max Hays

    Massachusetts Institute of Technology (MIT), MIT, Massachusetts Institute of Technology

  • Alexander Melville

    MIT Lincoln Laboratory

  • Bethany Huffman

    MIT Lincoln Laboratory

  • David K Kim

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Mollie E Schwartz

    MIT Lincoln Laboratory

  • Terry P Orlando

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology

  • Simon Gustavsson

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology

  • Jeffrey A Grover

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology

  • Kyle Serniak

    MIT Lincoln Laboratory

  • William D Oliver

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology (MIT), MIT Lincoln Laboratory, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology, Massachusetts Institute of Technology, MIT Lincoln Laboratory