Variations in ħ preserve state space within limits for quasi-free states on CCR algebra, with universally invariant states as convex combinations of Fock states with different ħ.
Petz, An Invitation to the Algebra of Canonical Commutation Relat ions, Leuven University Press
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Variable Planck's constant and scaling properties of states on Weyl algebra
Variations in ħ preserve state space within limits for quasi-free states on CCR algebra, with universally invariant states as convex combinations of Fock states with different ħ.