Entanglement witness
In quantum information theory, an entanglement witness is a functional which distinguishes a specific entangled state from separable ones. Entanglement witnesses can be linear or nonlinear functionals of the density matrix. If linear, then they can also be viewed as observables for which the expectation value of the entangled state is strictly outside the range of possible expectation values of any separable state.
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quantum information theory
Concept
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functional
Concept
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entangled state
Concept
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density matrix
Concept
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observables
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separable state
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Entanglement witness
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subclass of