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We demonstrate that inelastic neutron scattering technique can be used toindirectly detect and measure the macroscopic quantum correlations quantifiedby both entanglement and discord in a quantum magnetic material, VODPO4 . 1D2O.The amount of quantum correlations is obtained 2 by analyzing the neutronscattering data of magnetic excitations in isolated V4+ spin dimers. Ourquantitative analysis shows that the critical temperature of this material canreach as high as Tc = 82.5 K, where quantum entanglement drops to zero.Significantly, quantum discord can even survive at Tc = 300 K and may be usedin room temperature quantum devices. Taking into account the spin-orbit (SO)coupling, we also predict theoretically that entanglement can be significantlyenhanced and the critical temperature Tc increases with the strength ofspin-orbit coupling.

Quantum correlations in bulk properties of solids obtained from neutron scattering