Sensing chiral spin orders with entangled neutrons

We present a quantum entangled-probe scattering framework that extends van Hove's standard scattering theory, and apply it to directly unveil chiral spin orders. Previously, it has been shown that a neutron beam that possesses entanglement in its different degrees of freedom [1], for instance, trajectory, spin, and energy, can be employed to successfully distinguish entangled from un-entangled states in the case of spin dimer orders [2]. Here, we consider a similar entangled neutron beam to study both short-and long-range chiral spin orders. This study has implications in the study of complex quantum materials such as antiferromagnetic Mott insulators.

[1] Nat. Com. 11, 930 (2019)
[2] arXiv: 2008.04328