Can experimentally accessible entanglement measures distinguish quantum spin liquid and random singlet states?

Over the past decades, great progress has been made in the theoretical understanding of Quantum Spin Liquids (QSL). None the less, the identification of QSL in experiment remains a significant challenge. This is particularly true in materials with chemical or structural disorder, where there can be alternative routes to a magnetically-disordered ground state, such as a random singlet (RS) state.

One possible way to distinguish QSL from other, competing states is through their entanglement properties. However the most widely used theoretical measure, the entanglement entropy of the ground state, cannot be accessed in experiments on magnetic materials. For this reason, it is natural to ask whether their are other, experimentally-accessible, measures of entanglement which could be used to distinguish QSL from RS states?

In this talk we explore what can be learned from alternative "witnesses" of entanglement, and how these might be used to distinguish QSL from RS states in two-dimensional magnets with disorder.