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Thinking further, we can only measure something if there is correlation. e.g. correlation between the needle on the meter and the voltage in the circuit. Even a quantum measurement only exists if there is a correlation. For it takes an interaction to make a measurement, and we only know something about the particle being measured because it is somehow correlated with the particles interacting with it. So can you have correlation without entanglement? Isn't correlation the measure of entanglement (always)?

Thanks.