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Science
In reply to the discussion: Quantum Entanglement, Dark Counts, Coincidence Detection [View all]caraher
(6,278 posts)41. Part of it is preserving causality
Nature seems to be pretty good about enforcing causality, so if it were possible to exploit quantum measurement to send signals between spacelike-separated events I'd be terribly disappointed that Nature was so sloppy! I also think a lot of theorists much smarter than I am have ruled out any way of doing this within the standard framework of quantum theory, which he stood up to decades of efforts to tear it down, so as a betting man I'd say the odds are against Cramer.
Neither of these arguments is really physics, of course. It really all boils down to experiments and their interpretation. In the case of sending signals "back" in time, it needs to be very clear what counts as a "signal" and a lot of loopholes need to be closed.
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knowing they exist and know what everyone else calls them are two different things.
nebenaube
Jul 2013
#6
I don't see why what I need would be any bigger then say a .22 slug (for lack of a better reference)
nebenaube
Jul 2013
#37
Sorry for he late reply, bu yeah, I've been working with an optical breadboard
mindwalker_i
May 2014
#79
My intuition tells me the past and the future are rather symmetrical about any local present.
hunter
May 2014
#75