(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I'm trying to understand the preferred basis problem in the foundations of QM

Ok so I read somewhere that in general any state can be decomposed in different ways.

I don't quite see how this is meant to work

Suppose 'up' / 'down' represent z component of ang mom, then one spin state is

psi = 1/root 2 |up> + 1/root 2 |down>

What's another way to represent this same state in a different basis? How does it relate to the preferred basis problem?

Thanks

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Preferred Basis Problem

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