Detection of entanglement between collective spins

Abstract

Entanglement between individual spins can be detected by using thermodynamics quantities as entanglement witnesses. This applies to collective spins also, provided that their internal degrees of freedom are frozen, as in the limit of weakly-coupled nanomagnets. Here, we extend such approach to the detection of entanglement between subsystems of a spin cluster, beyond such weak-coupling limit. The resulting inequalities are violated in spin clusters with different geometries, thus allowing the detection of zero- and finite-temperature entanglement. Under relevant and experimentally verifiable conditions, all the required expectation values can be traced back to correlation functions of individual spins, that are now made selectively available by four-dimensional inelastic neutron scattering.

References in corpus (6)

• Entanglement detection
• Multipartite entanglement in spin chains
• Spin dynamics of molecular nanomagnets fully unraveled by four-dimensional inelastic neutron scattering
• Energy as an Entanglement Witness for Quantum Many-Body Systems
• Energy as witness of multipartite entanglement in spin clusters
• Towards the chemical tuning of entanglement in molecular nanomagnets

Cited by in corpus (3)

• Thermal entanglement and teleportation in a dipolar interacting system
• Entanglement witnesses in the XY chain: Thermal equilibrium and postquench nonequilibrium states
• Quantum entanglement generation on magnons assisted with microwave cavities coupled to a superconducting qubit