Mathieu Juan of Université de Sherbrooke, SilQ Connect

Quantum computing promises to deliver disruptive technologies by utilizing quantum states as computing elements. By entangling and creating quantum superpositions of qubits, exponential speedup of complex computational problems becomes possible. Interestingly, qubits can take vastly different forms—individual spins, quantized circuits, photons, or atoms—each operating at different energy scales. This diversity poses an exciting challenge: how can we interconnect qubits of different nature?

Photonics emerges as the essential solution. Optical photons offer low-loss propagation over long distances and compatibility with existing telecommunications infrastructure, making them ideal carriers for quantum information between remote processors. However, leading qubit platforms like superconducting circuits operate in the microwave regime, six orders of magnitude below optical frequencies. In this talk, I will present our work on microwave-to-optical transduction, addressing the fundamental challenge of coherently bridging this vast energy gap to enable scalable quantum networks.

Biography:

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. 

Address:Canada