Frequency Conversion Characteristics of Spatiotemporal Josephson Metasurfaces for Quantum Applications

This presentation explores the various characteristics of a nonreciprocal, frequency-converting Josephson metasurface operating at millikelvin temperatures. Leveraging the unique properties of Josephson junctions, which support supercurrent flow without resistance, this metasurface enables efficient manipulation of nonlinear wave interactions, facilitating both frequency conversion and amplification of incident photons.

💡 Research Summary

This paper presents a novel non‑reciprocal, frequency‑converting metasurface that operates at millikelvin temperatures, making it compatible with superconducting quantum technologies. The core concept is to combine space‑time modulation (STM) with the intrinsic nonlinearity of Josephson junctions. By arranging an array of Josephson junction field‑effect transistors (JFETs) into a planar metasurface and driving them with a space‑time‑varying current density J(z,t)=I₀ sin