From: richalivingston@gmail.com   
      
   On Thursday, October 13, 2022 at 2:59:07 PM UTC-5, Austin Fearnley wrote:   
   >...   
   >...The most believable assumption in my opinion is that nothing   
   > travels faster than light. Associated with this assumption is that   
   > retrocausality is the key to this problem.   
   >   
   > The implication of retrocausality is that quantum computers have no   
   > foundation in physics as particle always have local hidden variables.   
   > Also that time is two-way at the microscopic level. It is possible that   
   > quantum cryptography is supported by retrocausality as there is an   
   > apparent action at a distance despite nothing physically travelling faster   
   > than light locally.   
   >   
   > Austin Fearnley   
      
   Austin,   
      
   I think I am in general agreement with you.  If you assume no   
   communication of any kind faster than the speed of light then   
   "retrocausality" or "superdeterminism" are the natural conclusions.  If,   
   on the other hand you accept faster than light coordination between two   
   distant detection events you necessarily have an ambiguous causality   
   sequence, which I don't like.   
      
   It appears to me that while there are a significant number of physicists   
   that accept, or are willing to consider, retrocausality, it is still not   
   a mainstream concept among physicists.  I think the hesitation is   
   related to the idea of free will and the ability to determine your own   
   future.  Unfortunately this is probably on the boarder of proper science   
   since it may be untestable and unfalsifiable.  I would be very   
   interested in an idea for testing these ideas experimentally in a more   
   transparent way than the entanglement experiments.   
      
   Rich L.   
      
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