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===Entropy in Quantum Information Theory (Von Neumann Entropy)===
===Entropy in Quantum Information Theory (Von Neumann Entropy)===
In entangled systems, a useful quantity is the Von Neumann Entropy, defined (for a system with density matrix <math> \rho </math> by
In entangled systems, a useful quantity is the Von Neumann Entropy, defined (for a system with density matrix <math> \rho </math>) by
<math>
<math>