von Neumann entropy
English
Etymology
Named after John von Neumann.
Pronunciation
- IPA: /vɔn ˈnoɪ.mən ˈɛn.tɹə.pi/
Noun
von Neumann entropy
- (quantum mechanics) The entropy of a quantum state. If the state is expressed as a quantum density matrix
, then this entropy can be expressed mathematically as 
where 
is the trace operator and the logarithm is natural.
, then this entropy can be expressed mathematically as 
where 
is the