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Symmetric logarithmic derivative

 Home Mathematics Fields of mathematics Applied mathematics Theoretical computer science Quantum information science
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The symmetric logarithmic derivative (SLD) is a concept from the field of quantum information theory and quantum mechanics, particularly in the context of density matrices and quantum statistical mechanics. It is used to describe how a quantum state evolves and how it interacts with measurements. For a quantum system described by a density operator \( \rho \), the symmetric logarithmic derivative is defined in relation to a measurement or an observable \( A \).

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