IQI Weekly Seminar
Abstract: We will discuss the little oddities and joys of communicating through quantum fields. Relativity has its peculiar way of either helping or hinder at will quantum and classical communication tasks, and in general the transmission of quantum information. We will discuss the quantum channel consisting of two localized quantum systems that communicate through local coupling to a quantum field. We will show how relativistic causality and covariance play a role in these tasks, and that suitable protocols for this type of quantum channel require the careful navigation of several constraints, such as the no-cloning principle, the strong Huygens principle and the tendency of short field-matter couplings to be entanglement breaking. Time and decoherence permitting, we will also discuss how entanglement contained in quantum fields (even in spacelike separated regions) can be harvested and utilized (or not!) to assist communication.