Obviously you can't measure the particle simultaneously in the up and down 
state. Nobody believes that. Nobody is arguing it. Honestly it's hard to 
understand why you have such an agitated bee in your bonnet about 
superpositions. The mathematical expression of the photon polarised at 45 
degrees to the measurement apparatus is a normalised vector spanning the space 
of both up and down. I guess what you interpret that to mean is up to you since 
the mathematical predictions that arise from it are the same: 50% chance of up 
or down. Once again, you're simply arguing at cross purposes with Bruno, who 
clearly understands QM perfectly well. He's not saying the photon can be 
measured as up and down at the same time. He's just saying that any 
superposition of up and down is an eigenvector in some other orientation of the 

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