RQC Seminar

283rd RQC Seminar

• Speaker

  Mr. Dimitrios Georgiadis
  ( Forschungszentrum Jülich )

• Date

  16:30-, (4:30 p.m.-) Monday, June 15, 2026

• Venue

  Hybrid( Zoom,
  345-347 Seminar Room, 3F, Main Research Building, Wako Campus / 和光地区 研究本館3階 セミナー室 (345-347) (C01))

• Title

  Simple analytical flux tuned iSWAP pulses for leakage suppression

• Inquiries

  norilab_rqc_assist[at]ml.riken.jp

Abstract
Fast, high-fidelity two-qubit gates are a key requirement for scalable quantum computing in the noisy intermediate-scale quantum (NISQ) era and beyond. Tunable coupler architectures provide a flexible approach for implementing entangling gates through flux control with large on-off ratios, but fast flux modulation can induce diabatic transitions and population leakage to non-computational states, limiting gate fidelity. Here we present an analytical flux control method based on derivative removal by adiabatic gate (flux-DRAG) to suppress leakage in flux tunable two-qubit gates. We show that flux-based DRAG differs fundamentally from conventional microwave implementations and derive modified flux modulation protocols that suppress leakage below 10−4 for fast entangling gates. The method remains effective across a range of asymmetry between qubit anharmonicities and different circuit parameters, enabling high-fidelity two-qubit gates within the fifteen nanosecond range.