RQC Seminar

280th RQC Seminar

• Speaker

  Prof. Mathieu Juan
  ( University of Sherbrooke )

• Date

  15:30-16:30 (3:30pm-4:30pm), Wednesday June 17, 2026

• Venue

  Hybrid( Zoom,
  Room S507, 5F, Chemistry and Materials Physics Building, Wako Campus / 和光地区 物質科学研究棟5階 S507 (S51))

• Title

  Leveraging magnetomechanical interactions for transduction: an avenue towards distributed quantum computing

• Inquiries

  yasunobu.nakamura[at]riken.jp

Abstract
Optomechanical interactions in the microwave regime have been a very active field of research, leveraging advanced micro-fabrication techniques and the larger non-linearities enabled by superconducting circuits to reach regimes difficult to access in the optical regime. In this context, the interaction between the mechanical system and the circuit is realized through a change in the capacitance or the inductance. More recently, large interactions have been demonstrated with the inductive approach, providing a promising avenue towards the strong coupling regime. This approach relies on a flux sensitive microwave resonator coupled to a mechanical mode via a magnetic field.
In this presentation, I will present our group's recent progress in developing magneto-mechanical systems with clamped resonators for quantum transduction. Our methodology relies on distinct chips for the mechanical resonator and the circuit, enabling independent optimization of each component. We are developing micro-fabricated magnets to enhance the magneto-mechanical coupling of silicon-nitride membranes. In parallel, we are developing the optomechanical system to realize the complete magneto-optomechanical transducer. Preliminary experimental demonstrations suggest performance exceeding 60% efficiency with a bandwidth in the MHz range. While still in its early stages, our approach shows promise for distributed quantum networking across heterogeneous cryogenic qubit platforms.

Bio:
Mathieu obtained his PhD in nano-optics and nanotechnology in France in 2008 at Université de Technologie de Troyes, then worked as a post-doctoral researcher in Spain (ICFO), Australia (Macquarie University), and Austria (IQOQI) on various topics such as optical trapping, quantum optics, and superconducting circuits. In 2020, he joined the Département de Physique and Institut quantique at Université de Sherbrooke (Canada), where he now studies hybrid quantum systems with an emphasis on magneto-mechanical systems that couple mechanical and microwave components via magnetic interactions. Leveraging quantum circuits, his current work focuses on controlling and preparing quantum states in mechanical resonators for sensing and transduction applications. In early 2025 he co-founded a company, SilQ Connect, to develop quantum interconnects.