I have seen many times mention of measuring the 'speed' of state-change over quantum entanglement, and potentially measuring it. re: wave/particle 'duality' this paper explains everything extremely clearly and dispels such popular notions from my mind for a single particle: https://arxiv.org/ftp/quant-ph/papers/0703/0703126.pdf That is not my line of enquiry. Here, an explicit attempt to measure the 'speed' of quantum weirdness in entangled particles: http://arxiv.org/abs/1303.0614 "The lower bound is at least 10,000 times the speed of light" Yet delayed choice experiments record the state or position of particle A before a decision is even made about which measurement or state to impose on particle B. Yet the Bell test still shows the inequality as being violated, proving that independent local variables cannot explain the correlation which becomes apparent upon comparison of the data from A and B. Quantum spookiness again, except not just spacelike separation but temporal separation. http://arxiv.org/abs/quant-ph/0201134 http://arxiv.org/abs/1209.4191 Does this not prove that the 'speed' of quantum entanglement is >infinity i.e. independent of time? The conclusion paragraphs of these studies seem to suggest so... I know there are dissenting opinions on this but what theories are given most credence?