Characterization of iSWAP gate using a Dual-Transmon Coupler

ORAL

Abstract

Parametric circuits can implement fast and tunable interactions in multi-mode superconducting circuits. These interactions are typically activated by modulating a tunable coupling device at a linear combination of qubit frequencies, resulting in a strong frequency-selective interaction. One such design is the dual-transmon coupler (DTC) device, which facilitates strong exchange interaction between the data qubits while minimizing  ZZ coupling  simultaneously. This makes the DTC especially useful for realizing high-fidelity two-qubit gate operations such as iSWAP or CZ.

In this talk, we present the implementation and experimental characterization of the iSWAP gate on a DTC device. First, we briefly discuss the modular design and characteristics of the device. Then, we present a calibration routine for pulse optimization of the iSWAP that allows amplification and precise calibration of the unknown pulse parameters. We confirm the high gate fidelity and perform a detailed error budgeting for the iSWAP gate, with process tomography, randomized benchmarking (RB), as well as gate set tomography (GST).

[1] Physical Review Applied 19.6 (2023), 064043

*This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of under Award Number DE-SC0019461.

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Presenters

  • Tarush Tiwari

    • University of Massachusetts Lowell

Authors

  • Tarush Tiwari

    • University of Massachusetts Lowell

  • Daniel L Campbell

    • Air Force Research Laboratory (AFRL)

  • Guilhem J Ribeill

    • RTX BBN Technologies

  • Sudhir Sahu

    • University of Colorado Boulder, National Institute of Standards and Technology, Department of Physics and Applied Physics, University of Massachusetts Lowell
    • University of Colorado Boulder, National Institute of Standards and Technology
    • National Institute of Standards and Technology

  • Michael Senatore

    • Air Force Research Laboratory (AFRL)

  • Matthew LaHaye

    • Air Force Research Laboratory (AFRL)

  • Ray W Simmonds

    • National Institute of Standards and Technology, University of Colorado Boulder
    • National Institute of Standards and Technology
    • National Institute of Standards and Technology Boulder
    • The Global Coherence Project

  • Archana Kamal

    • Northwestern University
    • Northwestern University Evanston, University of Massachusetts Lowell
    • Northwestern University, Evanston, USA
    • University of Massachusetts

  • Leonardo M Ranzani

    • Raytheon BBN Technologies
    • RTX BBN Technologies, Quantum Photonics and Computing Group, Cambridge, MA
    • RTX BBN Technologies