We show that there is a one-to-one correspondence between wave functions and surfaces in the position-momentum phase plane bounded by a closed curve satisfying an exact quantum condition refining the usual EBK condition. This is achieved using an old forgotten idea of Enrico Fermi.
A Geometric Picture of Entanglement and Bell Inequalities
Geometric picture of quantum discord for two-qubit quantum states
The Fermionic Projector, Entanglement, and the Collapse of the Wave Function
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