Brazilian Twin Photons 32nd anniversary

TL;DR

This paper reviews over 30 years of development in twin-photon research in Brazil, emphasizing pioneering experiments, key contributions, and the growth of the scientific community in quantum optics.

Contribution

It provides a comprehensive historical overview of Brazilian advancements in twin-photon experiments and their impact on quantum optics research.

Findings

Brazilian research established SPDC as a key quantum optics tool

Significant experiments on entanglement and decoherence conducted in Brazil

Brazilian scientists contributed to foundational and applied quantum optics studies

Abstract

We present a historical review of the development and impact of spontaneous parametric down-conversion (SPDC) in Brazil, marking over three decades since the first twin-photon experiments were performed in the country. This article traces the pioneering efforts that initiated the field, highlighting key experiments, institutions, and researchers who contributed to its growth. We discuss seminal works that established SPDC as a fundamental tool in the Brazilian Quantum Optics community, including studies on spatial correlations, entanglement, and decoherence. By presenting a curated sequence of experiments, we offer an overview of how Brazilian research in twin-photon systems has explored profound concepts through fundamental demonstrations, leading to significant international impact. This review also highlights the formation of a strong scientific community and its ongoing efforts to turn fundamental knowledge into quantum applications.