29- what is realtion purety syster
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In quantum mechanics, and especially quantum information theory, the purity of a normalized quantum state is a scalar defined as
{\displaystyle \gamma \,\equiv \,{\mbox{tr}}(\rho ^{2})\,}{\displaystyle \gamma \,\equiv \,{\mbox{tr}}(\rho ^{2})\,}
where {\displaystyle \rho \,}\rho \, is the density matrix of the state. The purity defines a measure on quantum states, giving information on how much a state is mixed.
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