RQC Seminar

109th RQC Seminar

• Speaker

  Mr. Boxi Li
  ( Forschungszentrum Jülich )

• Date

  13:00-14:00, April 5, 2024 (Friday)

• Venue

  Hybrid(ZOOM・ Wako Room S507 at Wako Chem. ＆ Mat.Phys. Bldg. S51）

• Title

  Suppression of coherent errors in Cross-Resonance gates via recursive DRAG

• Inquiries

  rqc_info[at]ml.riken.jp

Abstract
The high-precision control of quantum logical operations is a prerequisite to increasing circuit depths in quantum processors, implementing useful quantum algorithms, and reaching fault-tolerant scalable architectures. A ubiquitous approach used for entangling gates has been all-microwave control of superconducting qubits, primarily using the Cross-Resonance two-qubit gate; however, fidelities are still limited by control imperfections. Here, we derive a universal analytical pulse shape that significantly improves fidelities in Cross-Resonance gates, suppressing both the three off-resonant transitions on the control qubit and unwanted two-qubit rotation operators. Experimentally tested on the IBM Quantum Platform, our proposed drive pulse demonstrates successful suppression of coherent errors, allowing for much faster gates than the current state-of-the-art. Despite limited remote access, across multiple qubit pairs, we achieve a notable two to threefold reduction in error for the CNOT gate, resulting in coherence-limited gates with fidelities in the 99.7% range.