ABSTRACT:

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. Beyond these applications in quantum science, Josephson meta-materials also offer opportunities to explore new quantum optical phenomena. I will present a recent experiment in which we observed entangled counter-propagating photons generated by a left-handed (or negative index) Josephson meta-material. This research is conducted in collaboration with the company Silent Waves.

BIO: 

Nicolas Roch is a permanent staff researcher at the CNRS-Néel Institute. His research focuses on superconducting qubits and superconducting parametric amplifiers. His current interests are centered around Josephson meta-materials that can serve as high-impedance environments for quantum simulators, large inductances for protected qubits, or low-loss waveguides for amplifiers that operate close to the quantum limit of noise. He is also a co-founder of the company Silent Waves, which commercializes ultra-low-noise amplifiers for applications in quantum science.