> On 16 Oct 2019, at 23:47, 'Brent Meeker' via Everything List 
> <[email protected]> wrote:
> 
> 
> 
> On 10/16/2019 2:05 PM, Philip Thrift wrote:
>> 
>> 
>> On Wednesday, October 16, 2019 at 3:49:12 PM UTC-5, Brent wrote:
>> 
>> 
>> On 10/16/2019 8:22 AM, John Clark wrote:
>>> On Tue, Oct 15, 2019 at 8:00 PM Bruce Kellett <[email protected] 
>>> <javascript:>> wrote:
>>> 
>>> > In the delayed choice experiment, the decision whether or not to quantum 
>>> > erase the "which way" information can be made long after the original 
>>> > photons hit the screen and make their marks there.
>>> 
>>> No. In the delayed choice experiment the decision on if to erase the 
>>> information about which slit the photon went through can be made after the 
>>> photon passes through the slit, even billions of years after, but it must 
>>> be made while the photon still exists and is inflight not after it hits the 
>>> screen.
>> 
>> I thought you read Carroll's book.  His example shows in what sense you can 
>> erase the information after the photon has hit the screen.
>> 
>> Brent
>> 
>> 
>> 
>> 
>> This ("you can erase the information after the photon has hit the screen") 
>> can be shown to be possible in Many Worlds theory?
>> 
>> What page of the book? (I'll get a copy and check it out.)
> 
> He's posted it on his blog https://www.preposterousuniverse.com/blog/ 
> <https://www.preposterousuniverse.com/blog/> almost word-for-word.


This corroborates with the fact that MWI, i.e. NON-collapse, does not allow 
neither FTL, nor retro-causality.

My “advise”: if your theory or your interpretation leads to FTL action, change 
the theory or the interpretation.

Bruno



> 
> Brent
> 
> 
>> 
>> @philipthrift
>> 
>>  
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