2018
DOI: 10.1007/s11128-018-1940-8
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## Abstract: Our main result is a monogamy inequality satisfied by the entanglement of a focus qubit (onetangle) in a four-qubit pure state and entanglement of subsystems. Analytical relations between three-tangles of three-qubit marginal states, two-tangles of two-qubit marginal states and unitary invariants of four-qubit pure state are used to obtain the inequality. The contribution of threetangle to one-tangle is found to be half of that suggested by a simple extension of entanglement monogamy relation for three qubits…

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