A coherent energy deficit in two-qubit states equals the square concurrence, establishing an energetic bound on entanglement that splits into quantum and classical parts for mixed states.
Ordering two-qubit states with concurrence and negativity,
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An Energetic Constraint for Qubit-Qubit Entanglement
A coherent energy deficit in two-qubit states equals the square concurrence, establishing an energetic bound on entanglement that splits into quantum and classical parts for mixed states.