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Additional
density state
English Wikipedia - The Free Encyclopedia
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Density matrix
A
density matrix
is a
matrix
that describes a
quantum system
in a
mixed state
, a
statistical ensemble
of several
quantum states
. This should be contrasted with a single
state vector
that describes a quantum system in a
pure state
. The density matrix is the quantum-mechanical analogue to a
phase-space
probability measure
(probability distribution of position and momentum) in classical
statistical mechanics
.
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