Diego Porras
(Instituto De Física Fundamental, Spain)

Abstract: Topology in quantum physics leads to phenomena that are robust against disorder and experimental imperfections. A paradigmatic example is the Majorana qubit, where quantum information is encoded in topologically protected Majorana zero modes. In this talk, I will present a topological framework for quantum driven-dissipative systems ^[1]. I will focus on linear and non-linear photonic chains, which describe, for example, arrays of coupled parametric amplifiers. I will show that a topological invariant can be defined in these systems that is associated with the emergence of robust, topologically protected, directional amplification of radiation. This theoretical framework is based on the theory of topological insulators, and it is a dissipative bosonic version of topological superconductors ^[2]. Our work can have applications, for example, in the design of efficient microwave amplifiers for superconducting quantum computers, as quantum-limited directional amplification remains a challenge in this field ^[3].

Zoom registration link:
https://zoom.us/meeting/register/3c0mBhcnQCi2Due0Z4G2xQ