Entanglement measure
Function that quantifies the amount of entanglement present in a quantum state
concurrence
a state invariant involving qubits, in quantum information science
entropy of entanglement
entanglement measure for a many-body quantum state
Squashed entanglement
Information-theoretic measure of quantum entanglement for a bipartite quantum system
entanglement of formation
quantity that measures the entanglement of a bipartite quantum state
Negativity
measure of quantum entanglement in quantum mechanics