On Friday, January 11, 2019 at 7:40:13 PM UTC, Brent wrote:
>
>
>
> On 1/11/2019 1:54 AM, agrays...@gmail.com <javascript:> wrote:
>
>
> *How can you prepare a system in any superposition state if you don't know 
> the phase angles beforehand? You fail to distinguish measuring or assuming 
> the phase angles from calculating them. One doesn't need Born's rule to 
> calculate them. Maybe what Bruce meant is that you can never calculate 
> them, but you can prepare a system with any relative phase angles. AG *
>
>
> In practice you prepare a "system" (e.g. a photon) in some particular but 
> unknown phase angle. Then you split the photon, or entangle it with another 
> photon, so that you have two with definite relative phase angles, and with 
> the same frequency,  then those two branches of the photon wave function 
> can interfere, i.e. the photon the interferes with itself as in the Young's 
> slits experiment.  So you only calculate the relative phase shift of the 
> two branches of the wf of the photon, which is enough to define the 
> interference pattern.
>
> Brent
>

*Can a photon be split without violating conservation of energy? In any 
event, I see my error on this issue of phase angles, and will describe it, 
possibly to show I am not a complete idiot when it comes to QM. Stayed 
tuned. AG* 

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