Poincaré sphere may refer to:
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Poincaré sphere (optics)
Unpolarized light is light with a random, time-varying polarization.
Natural light, like most other common sources of visible light, is produced independently by a large number of atoms or molecules whose emissions are uncorrelated.
Unpolarize ...
, a graphical tool for visualizing different types of polarized light
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Bloch sphere
In quantum mechanics and computing, the Bloch sphere is a geometrical representation of the pure state space of a two-level quantum mechanical system ( qubit), named after the physicist Felix Bloch.
Mathematically each quantum mechanical syst ...
, a related tool for representing states of a two-level quantum mechanical system
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Poincaré homology sphere
In algebraic topology, a homology sphere is an ''n''-manifold ''X'' having the homology groups of an ''n''-sphere, for some integer n\ge 1. That is,
:H_0(X,\Z) = H_n(X,\Z) = \Z
and
:H_i(X,\Z) = \ for all other ''i''.
Therefore ''X'' is a conne ...
, in mathematics, an example of a homology sphere
{{Disambiguation