To follow up on my earlier reply "Schroedinger Cat ... Physically Irrelevant":   
      
   The only way you're going to get any kind of macroscopic coherence is   
   with something that has no gravitational imprint. Because once it enters   
   the picture, there mere ability to see a gravitational difference, means   
   game over.   
      
   Spin bears no gravitational imprint. It can only affect torsion, and   
   unlike curvature, torsion cannot propagate outside of matter into free   
   space.   
      
   So, coherent superpositions involving spin lie outside the scope of what   
   I previously described.   
      
   Fast macroscopic-superposition-state generation by coherent driving   
   https://journals.aps.org/pra/abstract/10.1103/PhysRevA.97.013820   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)