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

• URL: http://arxiv.org/abs/2503.09343v1
• Date: Wed, 12 Mar 2025 12:39:53 GMT
• Title: SU(4) gate design via unitary process tomography: its application to cross-resonance based superconducting quantum devices
• Authors: Michihiko Sugawara, Takahiko Satoh,
• Abstract summary: We present a novel approach for implementing pulse-efficient SU(4) gates on superconducting quantum devices.<n>Our method introduces a parameterized unitary derived from the CR-Hamiltonian propagator, which accounts for static-$ZZ$ interactions.<n>We evaluate the average fidelity and gate time of various SU(4) gates generated using the $R_ZZ(theta)$ to confirm the advantages of our implementation.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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, $R_{ZZ}(\theta)$, 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 $R_{ZZ}(\theta)$ to confirm the advantages of our implementation.

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