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{{See also|Quantum statistical mechanics}}
{{Quantum mechanics|cTopic=Advanced topics}}
A '''density matrix''' is a [[matrix (math)|matrix]] that describes the statistical state of a system in [[quantum mechanics]].
Describing a quantum state by its density matrix is a fully general alternative formalism to describing a quantum state by its ket (state vector) or by its statistical ensemble of kets. However, in practice, it is often most convenient to use density matrices for calculations involving mixed states, and to use kets for calculations involving only pure states.
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