From Wikipedia, the free encyclopedia
Poincaré sphere may refer to:
- Poincaré sphere (optics), a graphical tool for visualizing different types of polarized light
- Bloch sphere, a related tool for representing states of a two-level quantum mechanical system
- Poincaré homology sphere, in mathematics, an example of a homology sphere
- Poincaré disk model A conformal projection of H3 into a sphere
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