von Neumann entropy
(medicine, osteology) A skeletal disorder caused by various genetic mutations, affecting the development of cartilage.
(zoology) Living in a desert.
(US, idiomatic, dated) An execution by hanging, especially a lynching.
(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.
混合量子状態のエントロピーを計算するには、その密度行列を対角化して S = −tr(ρ log ρ) を評価する必要がある。
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