English Dictionary

von Neumann entropy

/vɔn ˈnoɪ.mən ˈɛn.tɹə.pi/

noun

(quantum mechanics) The entropy of a quantum state. If the state is expressed as a quantum density matrix 𝜌, then this entropy can be expressed mathematically as S=-tr(𝜌 log 𝜌) where tr is the trace operator and the logarithm is natural.

The von Neumann entropy measures the amount of uncertainty in a quantum system.

意味（1）

(quantum mechanics) The entropy of a quantum state. If the state is expressed as a quantum density matrix 𝜌, then this entropy can be expressed mathematically as S=-tr(𝜌 log 𝜌) where tr is the trace operator and the logarithm is natural.