Concurrence (quantum computing)

In quantum information science, the concurrence is a state invariant involving qubits. == Definition == The concurrence is an entanglement monotone (a way of measuring entanglement) defined for a mixed state of two qubits as: C ( ρ ) ≡ max ( 0 , λ 1 − λ 2 − λ 3 − λ 4 ) {\displaystyle {\mathcal {C}}(\rho )\equiv \max(0,\lambda _{1}-\lambda _{2}-\lambda _{3}-\lambda _{4})} in which λ 1 , .

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