What causes quantum entanglement?

Quantum entanglement arises from the interactions between particles, typically during processes such as particle collisions or decay. When two particles become entangled, their quantum states become linked, meaning the state of one particle instantaneously affects the state of the other, regardless of the distance separating them. This phenomenon is a fundamental aspect of quantum mechanics and challenges classical intuitions about separability and locality. The precise mechanisms behind entanglement are rooted in the principles of superposition and measurement in quantum theory.