State of superposition between neutrinos over large distances

The fact that quantum mechanics' effects remain over large distances is a proof, once more, than nature is quantum, as Richard Feynmann said in his famous lecture in the 80s the past century.
How do neutrinos maintain a quantum state (with no individual identities) for long distances? A group of researchers in the United States tests whether a system with two or more distinct states acts in a quantum or classical way. Measuring the oscillations of neutrinos, by using a modification of the reworking of the Leggett-Garg inequality, the results show that quantum features such as superposition prevail over large distances. Discover more by clicking on the picture below!​