Von Neumann entropy
id:
von-neumann-entropy-203-18200855
title:
Von Neumann entropy
text:
In physics, the von Neumann entropy, named after John von Neumann, is an extension of the concept of Gibbs entropy from classical statistical mechanics to quantum statistical mechanics. For a quantum-mechanical system described by a density matrix ρ, the von Neumann entropy is
- S = − tr , where tr denotes the trace and ln denotes the (natural) matrix logarithm. If the density matrix ρ is written in a basis of its eigenvectors | 1 ⟩, | 2 ⟩, | 3 ⟩, … as
- ρ = ∑ j η j | j ⟩ ⟨ j |, then the vo
brand slug:
wiki
category slug:
encyclopedia
description:
Type of entropy in quantum theory
original url:
https://en.wikipedia.org/wiki/Von_Neumann_entropy
date created:
2005-08-22T21:55:54Z
date modified:
2024-09-09T19:19:59Z
main entity:
{"identifier":"Q6961323","url":"https://www.wikidata.org/entity/Q6961323"}
image:
fields total:
13
integrity:
15