Von Neumann entropy

English

Etymology

Named after Template:W.

Pronunciation

• Template:IPA

Noun

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