A Mixed quantum state of the Bose-Einstein distribution

Bertt
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Why is the quantum state of the Bose-Einstein distribution mixed and not pure? Is there any mathematical proof on this?
 
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Bertt said:
he quantum state of the Bose-Einstein distribution
What quantum state are you talking about? Do you have a reference?
 
Bertt said:
See e.g. these course notes
Where do these notes talk about a Bose-Einstein distribution? What makes you think the "Bose-Einstein distribution" is a mixed quantum state?
 

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