On 7/30/2018 9:27 PM, Jason Resch wrote:
On Mon, Jul 30, 2018 at 11:21 PM Bruce Kellett <[email protected] <mailto:[email protected]>> wrote:From: *Jason Resch* <[email protected] <mailto:[email protected]>>On Mon, Jul 30, 2018 at 8:33 PM Bruce Kellett <[email protected] <mailto:[email protected]>> wrote: From: *Jason Resch* <[email protected] <mailto:[email protected]>>You can use "itself" only if this "it" can be in multiple locations and heading in different directions.That is a property of waves. But you will only ever observe a single photon from this wave..... Waves/Photons, doesn't matter what you call them. Within the quantum computer this wave/photon is simultaneously in many different locations/doing many different things, performing computations and doing useful work using all of its separate superposed instances of itself. Once it's done doing all this work it settles down on a final value which we can read. And it will be correct, and may have finished an enormous computation in a short period of time, if and only if, it did in fact split up and do all these independent things simultaneously.Or you can view the action of a quantum computer as a simple interference effect. Incorrect solutions to the algorithm destructively interfere. You don't have to introduce ideas such as 'being in different locations and doing different things.' It is just simple interference in a wave. (And it is all in one world, because interference can only occur within the one world.)To add some clarity, I would say interference effects of a superposed system can only be seen from the vantage point of another system which has not interacted with that superposed/interfering system.
I don't know what "seen from a vantage point" means, but you can't see anything without interacting with it.
On that we agree. But where did those other photons come from? How did they get to be in different positions going in different directions?They aren't. How do do you explain the experiment with beam splitters and recombining light at a half silvered mirror to interfere and only be reflected one way?Photons have both wave-like and particle-like properties. That is quantum physics. So do you accept or reject that this "wave" can be in different places simultaneously?A wave is not a localized object, so the same wave can extend to different locations.So then "a photon is not a localized object, so the same photon can extend to different locations." -- is this right or wrong?
Right. But it's localized in in the same world if it interferes with itself; and of course it is never spacelike separate from itself.
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