"A unifying principle explaining the numerical bounds of quantum correlations remains elusive, despite the efforts devoted to identifying it. Here, we show that these bounds are indeed not exclusive to quantum theory: for any abstract correlation scenario with compatible measurements, models based on classical waves produce probability distributions indistinguishable from those of quantum theory and, therefore, share the same bounds. We demonstrate this finding by implementing classical microwaves that propagate along meter-size transmission-line circuits and reproduce the probabilities of three emblematic quantum experiments. Our results show that the “quantum” bounds would also occur in a classical universe without quanta. The implications of this observation are discussed." http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.250404 http://arxiv.org/abs/1511.08144 I found this interesting "This shows that quantum correlations can be universally recreated with classical systems at the expense of some extra resources...extra memory...one bit of memory for each dichotomic decision ..."