Do I Misunderstand The Double Slit Experiment

[DougShrapnel]

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From wiki as well "the total pattern of signal photons never shows interference, and it is only when one looks at a subset of signal photons whose idlers were seen at a particular detector that an interference pattern can be recovered. So, the experiment would certainly not allow one to send a message back in time, and whether the experiment requires any sort of backwards causality to understand it would depend on one's interpretation of quantum mechanics." So why is this spooky again?

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Hmm. This is news to me. Also, it doesn't quite make sense. How could you look at a subset of photons that were seen at a particular detector if you have destroyed the information from the detectors? [img]/images/graemlins/confused.gif[/img]

[/ QUOTE ]It's all there in the wiki article they use a beem spliter on entagled particles. And test only a subset. I'm not an expert on this stuff, so grain of salt.