Enhancing the Detection of Natural Thermal Entanglement with Disorder

Abstract

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.

4 pages, 2 figures, accepted by Physical Review Letters

References in corpus (5)

• Energy as an Entanglement Witness for Quantum Many-Body Systems
• Quantum instability and edge entanglement in a quasi-long-range order
• Increasing entanglement through engineered disorder in the random Ising chain
• Witnessing Macroscopic Entanglement in a Staggered Magnetic Field
• The entanglement of the XY spin chain in a random magnetic field

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• Evidence for entanglement at high temperatures in an engineered molecular magnet
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• Enhancing precision of atomic clocks by tuning disorder in accessories
• Advancing Quantum Otto Engine Performance via Additional Magnetic Field and Effective Negative Temperature
• Estimating phase transition of perturbed J1-J2 Heisenberg quantum chain in mixtures of ground and first excited states