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2008

Enhancing the Detection of Natural Thermal Entanglement with Disorder

Hide, Jenny, Son, Wonmin, Vedral, Vlatko

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Physical systems have some degree of disorder present in them.

We discuss how to treat natural, thermal entanglement in any random macroscopic system from which a thermodynamic witness bounded by a constant can be found.
We propose that functional many-body perturbation theory be applied to allow either a quenched or an annealed average over the disorder to be taken.
We find when considering the example of an XX Heisenberg spin chain with a random coupling strength, that the region of natural entanglement detected by both witnesses can be enhanced by the disorder.

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