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

Oral-In-person

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)

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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)

  • Nicholas Bornman

    • Fermi National Accelerator Laboratory (Fermilab)

  • Yao Lu

    • Fermi National Accelerator Laboratory (Fermilab)

  • Tanay Roy

    • Fermi National Accelerator Laboratory (Fermilab)

  • Alysson Gold

    • Rigetti Computing

  • Ben Scharmann

  • Prasad Sarangapani

  • 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)