Can I read Topological Josephson parametric amplifier array: A proposal for directional, broadband, and low-noise amplification on EtoBox?

Topological Josephson parametric amplifier array: A proposal for directional, broadband, and low-noise amplification by Ramos, Tomás; Gómez-León, Álvaro; García-Ripoll, Juan José; González-Tudela, Alejandro; Porras, Diego is a scholarly article available to read on EtoBox.

What is Topological Josephson parametric amplifier array: A proposal for directional, broadband, and low-noise amplification about?

Low-noise microwave amplifiers are crucial for detecting weak signals in fields such as quantum technology and radio astronomy. However, designing an ideal amplifier is challenging, as it must cover a wide frequency range, add minimal noise, and operate directionally - amplifying signals only in the observer's direction while protecting the source from environmental interference. In this work, we demonstrate that an array of non-linearly coupled Josephson parametric amplifiers (JPAs) can collectively function as a directional, broadband quantum amplifier by harnessing topological effects. By applying a collective four-wave-mixing pump with inhomogeneous amplitudes and linearly increasing phase, we break time-reversal symmetry in the JPA array and stabilize a topological amplification regime where signals are exponentially amplified in one direction and exponentially suppressed in the opposite. We show that compact devices with few sites $N\sim 11-17$ can achieve exceptional performance, with gains exceeding 20 dB over a bandwidth ranging from hundreds of MHz to GHz, and reverse isolation suppressing backward noise by more than 30 dB across all frequencies. The device also operates

Author

Ramos, Tomás; Gómez-León, Álvaro; García-Ripoll, Juan José; González-Tudela, Alejandro; Porras, Diego

Published

2022

Language

EN