Entanglement Sudden Death in Three Qubit X-States - Quantum PhysicsReport as inadecuate

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Abstract: I explore the entanglement dynamics of a three qubit system in an initialX-state undergoing decoherence including the possible exhibition ofentanglement sudden death ESD. To quantify entanglement I utilize negativitymeasures and make use of appropriate entanglement witnesses. The negativityresults are then extended to X-states with an arbitraty number of qubits. Ialso demonstrate non-standard behavior of the tri-partite negativityentanglement metric, its sudden appearance after some amount of decoherencefollowed quickly by its disappearance. Finally, I solve for a lower bound onthe three qubit X-state concurrence, demonstrate when this bound goes to zero,and outline simplifcations for the calculation of higher order X-stateconcurrences.

Author: Yaakov S. Weinstein

Source: https://arxiv.org/

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