A tight, saturable monogamy bound shows that the sum of concurrence and concurrence of assistance in three-qubit pure states decreases strictly as entanglement with an external qubit increases.
Camalet, Internal entanglement and external correl ations of any form limit each other, Phys
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Tight Trade-off Between Internal, Assisted, and External Entanglement
A tight, saturable monogamy bound shows that the sum of concurrence and concurrence of assistance in three-qubit pure states decreases strictly as entanglement with an external qubit increases.