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# 7: The Density Matrix


• 7.1: The Density Matrix
A density matrix is a matrix that describes a quantum system in a mixed state, a statistical ensemble of several quantum states.

Thumbnail: measured density matrix of a thermal state. (CC SA-BY 3.0 unported; measured density matrix of a thermal state).​​​​​

This page titled 7: The Density Matrix is shared under a not declared license and was authored, remixed, and/or curated by Michael Fowler via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.