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Employing the concept of two-mode squeezed states from quantum optics, wedemonstrate a revealing physical picture for the antiferromagnetic ground stateand excitations. Superimposed on a N{\'e}el ordered configuration, a spin-fliprestricted to one of the sublattices is called a sublattice-magnon. We showthat an antiferromagnetic spin-up magnon is comprised by a quantumsuperposition of states with $n+1$ spin-up and $n$ spin-downsublattice-magnons, and is thus an enormous excitation despite its unit netspin. Consequently, its large sublattice-spin can amplify its coupling to otherexcitations. Employing von Neumann entropy as a measure, we show that theantiferromagnetic eigenmodes manifest a high degree of entanglement between thetwo sublattices, thereby establishing antiferromagnets as reservoirs for strongquantum correlations. Based on these novel insights, we outline strategies forexploiting the strong quantum character of antiferromagetic (squeezed-)magnonsand give an intuitive explanation for recent experimental and theoreticalfindings in antiferromagnetic magnon spintronics.

Antiferromagnetic magnons as highly squeezed Fock states underlying quantum correlations