Entanglement detection

High correlations between particles, or "spooky action at a distance", as Einstein said, is known as an entanglement, and it is a property only occurring in the quantum world. Even if we know that entanglement exists, it is very hard to measure, and this difficulty grows when the number of particles increases. A new protocol to detect entanglement has been proposed. Maybe we are a step closer to a broader awareness of the quantum physics.