SU(4) gate design via unitary process tomography: its application to cross-resonance based superconducting quantum devices

2025/03/12 by Michihiko Sugawara, Sugawara, Michihiko, Takahiko Satoh +1 · 2 citations
Engineering · Materials Science · #Advanced Materials Characterization Techniques #Electronic and Structural Properties of Oxides #FOS: Physical sciences #Quantum Physics (quant-ph) #Semiconductor materials and devices

paper · pdf · doi:10.48550/arxiv.2503.09343

openalex publication_date 2025/03/12 · openalex created_date 2025/10/13 · openalex updated_date 2026/07/28

Abstract

We present a novel approach for implementing pulse-efficient SU(4) gates on cross resonance (CR)-based superconducting quantum devices. Our method introduces a parameterized unitary derived from the CR-Hamiltonian propagator, which accounts for static-ZZ interactions. Leveraging the Weyl chamber's geometric structure, we successfully realize a continuous 2-qubit basis gate, R_ZZ(θ), as an echo-free pulse schedule on the IBM Quantum device ibm_kawasaki. We evaluate the average fidelity and gate time of various SU(4) gates generated using the R_ZZ(θ) to confirm the advantages of our implementation.

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