Lexic.us

Definition of Von Neumann entropy

1. Noun. (quantum physics) The entropy of a quantum state. If the state is expressed as a density operator $\backslash rho$, then this entropy can be expressed mathematically as $S\; =\; -\backslash text\{tr\}(\backslash rho\; \backslash log\; \backslash rho)$ where $\backslash text\{tr\}$ is the trace and the logarithm is natural. ¹

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