RQC Seminar

282nd RQC Seminar

• Speaker

  Mr. José Diogo da Costa Jesus
  ( Forschungszentrum Jülich )

• Date

  14:50-15:40, (2:50 p.m.-3:40 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

  Analytical blueprint for 99.999% fidelity X-gates on present superconducting hardware under strong driving

• Inquiries

  norilab_rqc_assist[at]ml.riken.jp

Abstract
Achieving very fast gates that undercut the natural limits set by decoherence requires going into the strong driving limit. Realizing single-qubit control predicted beyond semi-classical, time-dependent modeling has yet to be experimentally realized on superconducting and most other computing platforms.  In this regime, the common model of dynamics within a three-level manifold breaks down, and instead, we see new quantum error channels growing abruptly with decreasing time. To identify these error processes we systematically calculate the effect of multi-photon transitions that occur out of the computational space. We then derive analytical formulas to suppress these effects, as well as amplitude and phase errors on the qubit space; we term these R1D for suppressing the 0-2 transition and R2D when also suppressing 1-3 leakage. We also answer long-standing questions about the optimal values of the DRAG prefactor as well as constant detuning, when accounting for time-ordering, and also show how to calibrate other prefactors for further performance improvement.  Upon correcting these varied sources of error, we numerically demonstrate gate infidelities below 10E-5 for a 7ns pi-rotation when incorporating existing decoherence rates.