Enhancing the Detection of Natural Thermal Entanglement with Disorder

Details Enhancing the Detection of Natural Thermal Entanglement with Disorder Enhancing the Detection of Natural Thermal Entanglement with Disorder

2008-07-16

arxiv.org/abs/0807.2529v3

Phys. Rev. Lett. 102, 100503 (2009)

Physics

Quantum Physics

4 pages, 2 figures, accepted by Physical Review Letters

Scientific paper

10.1103/PhysRevLett.102.100503

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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