Understanding nonlocality in quantum theory

The study of the correlation between different sets of entangled particles has led to the development of Bell's inequalities. By quantifying existing correlations, these inequalities provide a framework for testing the boundaries between classical and quantum physics. Correlations that lead to violations of Bell's inequalities show the existence of a non-local behavior and challenge our classical understanding of how particles interact. Understanding and studying this type of non-local correlations are of particular importance, because the ability to create non-local quantum communication is one of the fundamental concepts in the field of quantum cryptography, secure communication and even the development of quantum computers. In addition to technological applications, these concepts have a profound effect on our understanding and experience of quantum mechanics and help us take great steps towards the advancement of science and technology.