On Sat, Apr 28, 2018 at 6:34 AM, Bruce Kellett <[email protected]>
wrote:

​>> ​
>> We won't know if Deutsch is wrong until the experiment is
>> actually performed as I expect it will be sometime in the next few
>> decades, but at least he made a stand and you did too,  he predicted
>> interference bands will be seen and you predicted there will be no
>> such bands. So much for the idea that the MWI is not testable.
>> ​
>>
>
> * ​> ​The trouble with this is that we do not know what is actually being
> tested.*
>

I know one thing for sure that is being tested, will we see interference
bands or will we not? Deutsch says we will see interference bands even
though we have a signed document from a intelligent being saying it knew
which slit every photon went through (although it has forgotten the which
way information it still remembers that at one time it did know it). You
say we will not see any interference bands under those circumstances. Logic
alone can not determine which one of you is correct, for that we need
experiment. Time will tell.


> ​> *​*
> *Is it MWI, or is it the idea that a measurement can be reversed?*
>

I think we already have a pretty clear answer to that question thanks to
the results of the delayed choice experiment first performed in 1999 and
repeated many times since then. The answer is its not easy but yes,
measurement can be reversed.

https://arxiv.org/pdf/quant-ph/9903047.pdf

​ John K Clark ​









>
>
> Bruce
>
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