RQC Seminar

213th RQC Seminar

• Speaker

  Prof. Eli Levenson-Falk
  ( University of Southern California, USA )

• Date

  11:00-12:00 (11:00 a.m. - 12:00 p.m.), August 19, 2025 (Tuesday)

• Venue

  Hybrid(ZOOM・ Room S507 at Wako Chem. and Mat. Phys. Bldg. / 物質棟5階 S507 (S51))

• Title

  Rapid Characterization and Calibration of Single-Qubit Gates

• Inquiries

  rqc_info[at]ml.riken.jp

Abstract
Errors in quantum gate operations can be the result of noise or coherent, repeatable evolution. These coherent errors may be the result of miscalibrated gate parameters or unknown environmental Hamiltonian terms. To correctly characterize a gate, it is essential to learn both the incoherent and coherent noise errors. We have recently developed two techniques for making gate characterization faster, more complete and more accurate. The first, deterministic benchmarking [1], uses repeated short series of gates to characterize all coherent and incoherent error mechanisms in just 4 fidelity measurements. The second, coherence stabilization [2], allows for ultra-sensitive measurements of qubit frequency, up to a factor of 1.96 more accurately than standard Ramsey interferometry. I will discuss these techniques as well as possible applications and extensions.


[1] Tripathi et al., Chem. Rev. 125, 5745 (2025); arXiv:2407.09942. https://pubs.acs.org/doi/full/10.1021/acs.chemrev.4c00870 https://arxiv.org/abs/2407.09942

[2] Hecht et al. Nature Communications 16, 3754 (2025). https://www.nature.com/articles/s41467-025-58947-4