pg40 QUANTUM MECHANICS (part 4 of 5)

Absurdity of Copenhagen Interpretation

This is absurd as can be seen in the following example.  Suppose a particle disintegrates into two particles, one spins clockwise and the other anticlockwise.  The two particles will travel opposite to each other at very high speed.  According to Copenhagen interpretation, before observation the spin directions of the two particles are undetermined, both having possibilities of being clockwise and being anticlockwise.  Only at observation time, they are collapsed to a determined state.  If particle A is observed (which means collapsed) to being clockwise, then the other, particle B, must be observed (collapsed) to being anticlockwise “instantly”, even if they have travelled to different corners in the universe.  It is unbelievable that the two particles, being widely apart, can communicate instantly at infinite speed (much faster than light). 

EPR Paradox and Confirmation of Copenhagen Interpretation

On the contrary, Einstein’s view (cooperated with Podolsky and Rosen, 1935, http://en.wikipedia.org/wiki/EPR_paradox) is that the two particles must have determined states of spin directions at time of separation, just waiting to be measured.  But neither Einstein, nor Bohr and Heisenberg lived long enough to witness an experimental confirmation of one view or the other.  An observation done in 1982 in the University of Paris by Aspect etc. confirmed that the Copenhagen interpretation is correct.  That is, quantum systems don’t have determined state until observation time.  Only at observation time, the system is “collapsed” to a fixed state. 

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