Multipartite entanglement in the one-dimensional spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math> Heisenberg antiferromagnet
Varun Menon, Nicholas E. Sherman, Maxime Dupont, Allen Scheie, D. M. Tennant, Joel E. Moore
Abstract
Multipartite entanglement was thought to be intrinsically difficult to measure in solids, but recent work has established connections between multipartite entanglement, dynamic susceptibilities, and neutron scattering data, via the quantum Fisher information. This work focuses on the paradigmatic spin-half chain and shows that there are further simplifications: even static structure factors contain quantitative information about multipartite entanglement at low temperatures. Theory, numerics, and experiment then suggest that a high degree of multipartite entanglement is observable in Heisenberg chain compounds, including KCuF${}_{3}$.
Topics & Concepts
Quantum entanglementMultipartiteMultipartite entanglementSpin (aerodynamics)PhysicsQuantum mechanicsStatistical physicsQuantumSquashed entanglementThermodynamicsQuantum many-body systemsPhysics of Superconductivity and MagnetismQuantum and electron transport phenomena