What is quantum entanglement? 📓 The short answer Quantum entanglement is a phenomenon in which two particles are linked together in such a way that the state of one particle is dependent on the state of the other, no matter how far apart they are. 📚 The long answer Let's start with some vocabulary. What do these words mean? Quantum mechanics is a branch of physics that studies the tiniest building blocks of matter, like atoms and even smaller particles. In other words, it's the physics of...