Tuning entanglement by squeezing magnons in anisotropic magnets

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We theoretically study the entanglement between two arbitrary spins in a magnetic material where magnons naturally form a general squeezed coherent state in the presence of an applied magnetic field and axial anisotropies. Employing concurrence as a measure of entanglement, we demonstrate that spins are generally entangled in thermodynamic equilibrium, with the amount of entanglement controlled by the external fields and anisotropies. As a result, the magnetic medium can serve as a resource to store and process quantum information. We furthermore show that the entanglement can jump discontinuously when decreasing the transverse magnetic field. This tunable entanglement can be potentially used as an efficient switch in quantum-information processing tasks.
Publisher
AMER PHYSICAL SOC
Issue Date
2020-01
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B, v.101, no.1, pp.014416

ISSN
2469-9950
DOI
10.1103/PhysRevB.101.014416
URI
http://hdl.handle.net/10203/276842
Appears in Collection
PH-Journal Papers(저널논문)
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