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.
Thus if Eve were to intercept this pure state, she would have access to the full entangled resource
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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.