Demonstration of Cross-Resonance Gates with Resonator-Assisted ZZ Cancellation

ORAL

Abstract

We present the characterization of a CNOT gate realized by combining cross-resonance interaction with resonator-assisted ZZ cancellation in fixed-frequency transmons on a Rigetti–SQMS co-developed quantum processor. Extending earlier work on dynamical ZZ cancellation via off-resonant resonator drives [1], we demonstrate a direct CNOT gate implementation achieved through two microwave drives on the transmons that generate a CX rotation in the |10⟩−|11⟩ subspace while selectively darkening the |00⟩−|01⟩ transition. This tunable-coupler-free approach enables high-fidelity gates and enhances the scalability of superconducting quantum architectures.

[1] Z. Huang et al., Phys. Rev. Applied 22, 034007 (2024)

*This work was supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Superconducting Quantum Materials and Systems Center (SQMS), under Contract No. 89243024CSC000002. Fermilab is operated by Fermi Forward Discovery Group, LLC under Contract No. 89243024CSC000002 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.

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Presenters

  • Paul Heidler

    • Fermi National Accelerator Laboratory (Fermilab)

Authors

  • Paul Heidler

    • Fermi National Accelerator Laboratory (Fermilab)

  • Ziwen Huang

    • Fermi National Accelerator Laboratory (Fermilab)

  • Nick Bornman

    • Fermi National Accelerator Laboratory (Fermilab)
    • SQMS, Fermi National Accelerator Laboratory, Batavia, Illinois, 60510, USA

  • Yao Lu

    • Fermi National Accelerator Laboratory (Fermilab)

  • Tanay Roy

    • Fermi National Accelerator Laboratory (Fermilab)

  • Alysson Gold

    • Rigetti Computing

  • Ben Scharmann

    • Rigetti Computing

  • Prasad Sarangapani

    • Rigetti Computing

  • Andrew Bestwick

    • Rigetti Computing

  • Shaojiang Zhu

    • Fermi National Accelerator Laboratory (Fermilab)

  • David van Zanten

    • Fermi National Accelerator Laboratory (Fermilab)

  • Anna Grassellino

    • Fermi National Accelerator Laboratory (Fermilab)
    • Fermi National Accelerator Laboratory, Batavia, Illinois, 60510, USA