From: *Bruno Marchal* <[email protected] <mailto:[email protected]>>
On 8 Aug 2019, at 13:59, Bruce Kellett <[email protected]
<mailto:[email protected]>> wrote:
On Thu, Aug 8, 2019 at 8:51 PM Bruno Marchal <[email protected]
<mailto:[email protected]>> wrote:
If the superposition are not relevant, then I don’t have any minimal
physical realist account of the two slit experience, or even the
stability of the atoms.
Don't be obtuse, Bruno. Of course there is a superposition of the
paths in the two slit experiment. But these are not orthogonal basis
vectors. That is why there is interference.
But each path are orthogonal. See the video of Susskind, where he use
1 and 0 to describe the boxes where we can find by which hole the
particles has gone through. Then, without looking at which hole the
particle has gone through, we can get the interference of the wave
which is obliged to be taken as spread on both holes, and that
represent the superposition of the two orthogonal state described here
as 0 and 1.
I seldom watch long videos of lectures. But if Susskind is saying that
the paths taken by the particle through the two slits are orthogonal
then he is flatly wrong. Writing the paths as 1 and 0 does not make them
orthogonal. And if they were orthogonal they could not interact, and you
would not get interference. Two states |0> and |1> are orthogonal if
their overlap vanishes: <0|1> = 0. Interference comes from the overlap,
so if this vanishes, there is no interference.
Either Susskind is terminally confused, or you have misrepresented him.
Bruce
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