Josephson metamaterials as near-quantum-limited microwave amplifiers

by Nicolas Roch (Institut Néel - CNRS)

Wednesday Nov 26, 2025, 4:00 PM → 5:00 PM Europe/Madrid

C7b/058 - Seminar (IFAE Main Building C7b)

Josephson meta-materials have recently emerged as a highly promising platform for superconducting quantum science and technology. Their unique potential lies in the ability to engineer these materials at sub-wavelength scales, allowing for complete control over wave dispersion and nonlinear interaction. 

In this seminar, I will demonstrate how Josephson meta-materials can be utilized as microwave amplifiers with added noise that approaches the quantum limit. These materials are already widely used in experiments ranging from quantum information processing with superconducting qubits to dark matter detection. 

In the second part, I will present a recent experiment demonstrating a microwave amplifier that exhibits intrinsic isolation and can be used to read out a superconducting qubit without the need for magnetic isolators.

This research is conducted in collaboration with the company Silent Waves.