gill1109 wrote:harry wrote:I just read the very interesting discussion here above, and perhaps I have a solution to the mutual misunderstanding here. For it appears to me that technically speaking, for simulations and derivations Gill (and probably everyone else!) uses not exactly CFD but what I will call UFD: unfactual determinism. This may be the source of the misunderstanding that also came up in other threads, appearing in a different form.
In a simulation one can calculate based on theoretical considerations what will happen to an entity if angle a is chosen OR what will happen if instead angle a' is chosen. And according to theory, it makes no difference for the end result of measuring on a large number of entities if first angle a and then angle a' is chosen, or if first a' and then a is chosen. On each entity only one measurement is performed in a real experiment, and also that can be simulated. Thus, a method that looks like your "strong interpretation" ("what if") can be used to predict with imaginary experiments the outcome of real experiments - and with real experiments your "weak interpretation" applies (each entity measured only once).
Exactly, Harry!
This is how Evidence Based Medicine works. Double Blind Randomized Clinical Trials. You cannot give the same patient two different treatments. You assign patients at random to one or the other treatment. The cure rate in each of the two subsamples tells us what the cure rate is for new patients picked from the same population and always given just one of the two treatments.
One of the ingredients of a loophole free experiment is the random choice of measurement settings, time and time again, while the particles are on their way from the source to the detector. Alice's measurement has to be finished before Bob's setting could even be known at Alice's place (supposing that no information goes faster than the speed of light).
Yes... BUT: I'm afraid that if minkwe reads my reply in the light of your comment, he may miss the point that I tried to make. I suspect that the things you tell here already were clear to him - he might even say that it's also his point that each particle can only be measured once! However, perhaps you already made the same point as me, although less elaborated, when you stressed "imagine".
CFD, as minkwe highlighted, corresponds to actually performed experiments, in which we hypothise the effect of choosing a setting that was not chosen compared to one that in fact was chosen. Strictly speaking, your simulations do
not use CFD although what you do is similar: they do
not emulate such a hypothetical effect of (impossible and never performed) multiple settings on a single entity; instead they predict the possible outcomes for series of different entities as function of chosen detection angles.
Perhaps miknwe's example of flipping coins should be elaborated. Then what you are doing, I guess, corresponds to considering a population of coins, some old and damaged, other new; and you predict by calculation or simulation how likely a random coin will be accepted by coffee machine A or B (which
looks a bit like CFD but it is not) - and from that, what fraction of coins will be accepted by each machine.
That does of course not imply that you are making a prediction for a coin that is accepted by machine A, how much chance there would have been to have been accepted by machine B (CFD).
In summary, maybe with "realism" you mean what I call "determinism"; and determinism leads to CFD when considering really performed experiments. Does that work for you?