Tri-partite Entanglement Witnesses and Sudden Death

Details Tri-partite Entanglement Witnesses and Sudden Death Tri-partite Entanglement Witnesses and Sudden Death

2008-12-25

arxiv.org/abs/0812.4612v1

Phys. Rev. A 79, 012318 (2009)

Physics

Quantum Physics

7 pages, 4 (composite) figures, accepted PRA

Scientific paper

10.1103/PhysRevA.79.012318

I explore entanglement dynamics in a three qubit system comparing the ability of entanglement witnesses to detect tri-partite entanglement to the phenomenon of entanglement sudden death (ESD). Using a system subject to dephasing I invoke entanglement witnesses to detect tri-partite GHZ and W-type entanglement and compare the evolution of their detection capabilites with the evolution of the negativity, bi-partite concurrence, and tri-partite negativity. Interestingly, I find a state in which there is no concurrence or tri-partite negativity but there is entanglement. Finally, I utilize a three qubit quantum error correction (QEC) code to address how ESD affects the abilities of quantum error correction.

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